diff --git a/metagpt/actions/rebuild_class_view.py b/metagpt/actions/rebuild_class_view.py
index adc28ff9d..dbc11d14b 100644
--- a/metagpt/actions/rebuild_class_view.py
+++ b/metagpt/actions/rebuild_class_view.py
@@ -14,11 +14,16 @@ import aiofiles
 from metagpt.actions import Action
 from metagpt.config import CONFIG
 from metagpt.const import (
-    CLASS_VIEW_FILE_REPO,
+    AGGREGATION,
+    COMPOSITION,
     DATA_API_DESIGN_FILE_REPO,
+    GENERALIZATION,
     GRAPH_REPO_FILE_REPO,
 )
+from metagpt.logs import logger
 from metagpt.repo_parser import RepoParser
+from metagpt.schema import ClassAttribute, ClassMethod, ClassView
+from metagpt.utils.common import split_namespace
 from metagpt.utils.di_graph_repository import DiGraphRepository
 from metagpt.utils.graph_repository import GraphKeyword, GraphRepository
 
@@ -34,34 +39,157 @@ class RebuildClassView(Action):
         symbols = repo_parser.generate_symbols()  # use ast
         for file_info in symbols:
             await GraphRepository.update_graph_db_with_file_info(graph_db, file_info)
-        # await graph_db.save(path=graph_repo_pathname.parent)
         await self._create_mermaid_class_views(graph_db=graph_db)
-        await self._save(graph_db=graph_db)
+        await graph_db.save()
 
     async def _create_mermaid_class_views(self, graph_db):
         path = Path(CONFIG.git_repo.workdir) / DATA_API_DESIGN_FILE_REPO
         path.mkdir(parents=True, exist_ok=True)
-        async with aiofiles.open(str(path / CONFIG.git_repo.workdir.name), mode="w", encoding="utf-8") as writer:
-            await writer.write("classDiagram\n")
+        pathname = path / CONFIG.git_repo.workdir.name
+        async with aiofiles.open(str(pathname.with_suffix(".mmd")), mode="w", encoding="utf-8") as writer:
+            content = "classDiagram\n"
+            logger.debug(content)
+            await writer.write(content)
             # class names
             rows = await graph_db.select(predicate=GraphKeyword.IS, object_=GraphKeyword.CLASS)
-            distinct = {}
+            class_distinct = set()
+            relationship_distinct = set()
             for r in rows:
-                await RebuildClassView._create_mermaid_class(r, graph_db, writer, distinct)
+                await RebuildClassView._create_mermaid_class(r.subject, graph_db, writer, class_distinct)
+            for r in rows:
+                await RebuildClassView._create_mermaid_relationship(r.subject, graph_db, writer, relationship_distinct)
 
     @staticmethod
     async def _create_mermaid_class(ns_class_name, graph_db, file_writer, distinct):
-        pass
-        # fields = split_namespace(ns_class_name)
-        # await graph_db.select(subject=ns_class_name)
+        fields = split_namespace(ns_class_name)
+        if len(fields) > 2:
+            # Ignore sub-class
+            return
 
-    async def _save(self, graph_db):
-        class_view_file_repo = CONFIG.git_repo.new_file_repository(relative_path=CLASS_VIEW_FILE_REPO)
-        dataset = await graph_db.select(predicate=GraphKeyword.HAS_CLASS_VIEW)
-        all_class_view = []
-        for spo in dataset:
-            title = f"---\ntitle: {spo.subject}\n---\n"
-            filename = re.sub(r"[/:]", "_", spo.subject) + ".mmd"
-            await class_view_file_repo.save(filename=filename, content=title + spo.object_)
-            all_class_view.append(spo.object_)
-        await class_view_file_repo.save(filename="all.mmd", content="\n".join(all_class_view))
+        class_view = ClassView(name=fields[1])
+        rows = await graph_db.select(subject=ns_class_name)
+        for r in rows:
+            name = split_namespace(r.object_)[-1]
+            name, visibility, abstraction = RebuildClassView._parse_name(name=name, language="python")
+            if r.predicate == GraphKeyword.HAS_CLASS_PROPERTY:
+                var_type = await RebuildClassView._parse_variable_type(r.object_, graph_db)
+                attribute = ClassAttribute(
+                    name=name, visibility=visibility, abstraction=bool(abstraction), value_type=var_type
+                )
+                class_view.attributes.append(attribute)
+            elif r.predicate == GraphKeyword.HAS_CLASS_FUNCTION:
+                method = ClassMethod(name=name, visibility=visibility, abstraction=bool(abstraction))
+                await RebuildClassView._parse_function_args(method, r.object_, graph_db)
+                class_view.methods.append(method)
+
+        # update graph db
+        await graph_db.insert(ns_class_name, GraphKeyword.HAS_CLASS_VIEW, class_view.model_dump_json())
+
+        content = class_view.get_mermaid(align=1)
+        logger.debug(content)
+        await file_writer.write(content)
+        distinct.add(ns_class_name)
+
+    @staticmethod
+    async def _create_mermaid_relationship(ns_class_name, graph_db, file_writer, distinct):
+        s_fields = split_namespace(ns_class_name)
+        if len(s_fields) > 2:
+            # Ignore sub-class
+            return
+
+        predicates = {GraphKeyword.IS + v + GraphKeyword.OF: v for v in [GENERALIZATION, COMPOSITION, AGGREGATION]}
+        mappings = {
+            GENERALIZATION: " <|-- ",
+            COMPOSITION: " *-- ",
+            AGGREGATION: " o-- ",
+        }
+        content = ""
+        for p, v in predicates.items():
+            rows = await graph_db.select(subject=ns_class_name, predicate=p)
+            for r in rows:
+                o_fields = split_namespace(r.object_)
+                if len(o_fields) > 2:
+                    # Ignore sub-class
+                    continue
+                relationship = mappings.get(v, " .. ")
+                link = f"{o_fields[1]}{relationship}{s_fields[1]}"
+                distinct.add(link)
+                content += f"\t{link}\n"
+
+        if content:
+            logger.debug(content)
+            await file_writer.write(content)
+
+    @staticmethod
+    def _parse_name(name: str, language="python"):
+        pattern = re.compile(r"<I>(.*?)<\/I>")
+        result = re.search(pattern, name)
+
+        abstraction = ""
+        if result:
+            name = result.group(1)
+            abstraction = "*"
+        if name.startswith("__"):
+            visibility = "-"
+        elif name.startswith("_"):
+            visibility = "#"
+        else:
+            visibility = "+"
+        return name, visibility, abstraction
+
+    @staticmethod
+    async def _parse_variable_type(ns_name, graph_db) -> str:
+        rows = await graph_db.select(subject=ns_name, predicate=GraphKeyword.HAS_TYPE_DESC)
+        if not rows:
+            return ""
+        vals = rows[0].object_.replace("'", "").split(":")
+        if len(vals) == 1:
+            return ""
+        val = vals[-1].strip()
+        return "" if val == "NoneType" else val + " "
+
+    @staticmethod
+    async def _parse_function_args(method: ClassMethod, ns_name: str, graph_db: GraphRepository):
+        rows = await graph_db.select(subject=ns_name, predicate=GraphKeyword.HAS_ARGS_DESC)
+        if not rows:
+            return
+        info = rows[0].object_.replace("'", "")
+
+        fs_tag = "("
+        ix = info.find(fs_tag)
+        fe_tag = "):"
+        eix = info.rfind(fe_tag)
+        if eix < 0:
+            fe_tag = ")"
+            eix = info.rfind(fe_tag)
+        args_info = info[ix + len(fs_tag) : eix].strip()
+        method.return_type = info[eix + len(fe_tag) :].strip()
+        if method.return_type == "None":
+            method.return_type = ""
+        if "(" in method.return_type:
+            method.return_type = method.return_type.replace("(", "Tuple[").replace(")", "]")
+
+        # parse args
+        if not args_info:
+            return
+        splitter_ixs = []
+        cost = 0
+        for i in range(len(args_info)):
+            if args_info[i] == "[":
+                cost += 1
+            elif args_info[i] == "]":
+                cost -= 1
+            if args_info[i] == "," and cost == 0:
+                splitter_ixs.append(i)
+        splitter_ixs.append(len(args_info))
+        args = []
+        ix = 0
+        for eix in splitter_ixs:
+            args.append(args_info[ix:eix])
+            ix = eix + 1
+        for arg in args:
+            parts = arg.strip().split(":")
+            if len(parts) == 1:
+                method.args.append(ClassAttribute(name=parts[0].strip()))
+                continue
+            method.args.append(ClassAttribute(name=parts[0].strip(), value_type=parts[-1].strip()))
diff --git a/metagpt/actions/write_code.py b/metagpt/actions/write_code.py
index 25c4912c3..7377442b5 100644
--- a/metagpt/actions/write_code.py
+++ b/metagpt/actions/write_code.py
@@ -130,7 +130,7 @@ class WriteCode(Action):
         if not coding_context.code_doc:
             # avoid root_path pydantic ValidationError if use WriteCode alone
             root_path = CONFIG.src_workspace if CONFIG.src_workspace else ""
-            coding_context.code_doc = Document(filename=coding_context.filename, root_path=root_path)
+            coding_context.code_doc = Document(filename=coding_context.filename, root_path=str(root_path))
         coding_context.code_doc.content = code
         return coding_context
 
diff --git a/metagpt/repo_parser.py b/metagpt/repo_parser.py
index f4a9a7f3a..465f40d63 100644
--- a/metagpt/repo_parser.py
+++ b/metagpt/repo_parser.py
@@ -155,7 +155,8 @@ class RepoParser(BaseModel):
             else:
                 raise NotImplementedError(f"Not implement:{val}")
             return code_block
-        raise NotImplementedError(f"Not implement code block:{node.lineno}, {node.end_lineno}, {any_to_str(node)}")
+        logger.warning(f"Unsupported code block:{node.lineno}, {node.end_lineno}, {any_to_str(node)}")
+        return None
 
     @staticmethod
     def _parse_expr(node) -> List:
@@ -193,7 +194,7 @@ class RepoParser(BaseModel):
                     tokens.append(v)
             return tokens
         except Exception as e:
-            logger.warning(e)
+            logger.warning(f"Unsupported if: {n}, err:{e}")
         return tokens
 
     @staticmethod
@@ -220,8 +221,7 @@ class RepoParser(BaseModel):
                 raise NotImplementedError(f"Not implement:{node}")
             return func(node)
         except Exception as e:
-            logger.warning(e)
-            raise e
+            logger.warning(f"Unsupported variable:{node}, err:{e}")
 
     @staticmethod
     def _parse_assign(node):
@@ -274,7 +274,7 @@ class RepoParser(BaseModel):
             class_views.append(class_info)
         return class_views
 
-    async def _parse_class_relationships(self, class_view_pathname) -> List[ClassRelationShip]:
+    async def _parse_class_relationships(self, class_view_pathname) -> List[ClassRelationship]:
         relationship_views = []
         if not class_view_pathname.exists():
             return relationship_views
@@ -365,7 +365,7 @@ class RepoParser(BaseModel):
     @staticmethod
     def _repair_namespaces(
         class_views: List[ClassInfo], relationship_views: List[ClassRelationship], path: str | Path
-    ) -> (List[ClassInfo], List[ClassRelationShip]):
+    ) -> (List[ClassInfo], List[ClassRelationship]):
         if not class_views:
             return []
         c = class_views[0]
diff --git a/metagpt/schema.py b/metagpt/schema.py
index e36bef395..02d44f767 100644
--- a/metagpt/schema.py
+++ b/metagpt/schema.py
@@ -451,3 +451,63 @@ class CodeSummarizeContext(BaseModel):
 
 class BugFixContext(BaseContext):
     filename: str = ""
+
+
+# mermaid class view
+class ClassMeta(BaseModel):
+    name: str = ""
+    abstraction: bool = False
+    static: bool = False
+    visibility: str = ""
+
+
+class ClassAttribute(ClassMeta):
+    value_type: str = ""
+    default_value: str = ""
+
+    def get_mermaid(self, align=1) -> str:
+        content = "".join(["\t" for i in range(align)]) + self.visibility
+        if self.value_type:
+            content += self.value_type + " "
+        content += self.name
+        if self.default_value:
+            content += "="
+            if self.value_type not in ["str", "string", "String"]:
+                content += self.default_value
+            else:
+                content += '"' + self.default_value.replace('"', "") + '"'
+        if self.abstraction:
+            content += "*"
+        if self.static:
+            content += "$"
+        return content
+
+
+class ClassMethod(ClassMeta):
+    args: List[ClassAttribute] = Field(default_factory=list)
+    return_type: str = ""
+
+    def get_mermaid(self, align=1) -> str:
+        content = "".join(["\t" for i in range(align)]) + self.visibility
+        content += self.name + "(" + ",".join([v.get_mermaid(align=0) for v in self.args]) + ")"
+        if self.return_type:
+            content += ":" + self.return_type
+        if self.abstraction:
+            content += "*"
+        if self.static:
+            content += "$"
+        return content
+
+
+class ClassView(ClassMeta):
+    attributes: List[ClassAttribute] = Field(default_factory=list)
+    methods: List[ClassMethod] = Field(default_factory=list)
+
+    def get_mermaid(self, align=1) -> str:
+        content = "".join(["\t" for i in range(align)]) + "class " + self.name + "{\n"
+        for v in self.attributes:
+            content += v.get_mermaid(align=align + 1) + "\n"
+        for v in self.methods:
+            content += v.get_mermaid(align=align + 1) + "\n"
+        content += "".join(["\t" for i in range(align)]) + "}\n"
+        return content
diff --git a/metagpt/utils/common.py b/metagpt/utils/common.py
index b5bb41f26..0032f0b0d 100644
--- a/metagpt/utils/common.py
+++ b/metagpt/utils/common.py
@@ -408,7 +408,7 @@ def concat_namespace(*args) -> str:
 
 
 def split_namespace(ns_class_name: str) -> List[str]:
-    pass
+    return ns_class_name.split(":")
 
 
 def general_after_log(i: "loguru.Logger", sec_format: str = "%0.3f") -> typing.Callable[["RetryCallState"], None]:
diff --git a/metagpt/utils/graph_repository.py b/metagpt/utils/graph_repository.py
index f9eb273f9..88946c98e 100644
--- a/metagpt/utils/graph_repository.py
+++ b/metagpt/utils/graph_repository.py
@@ -13,6 +13,7 @@ from typing import List
 
 from pydantic import BaseModel
 
+from metagpt.logs import logger
 from metagpt.repo_parser import ClassInfo, ClassRelationship, RepoFileInfo
 from metagpt.utils.common import concat_namespace
 
@@ -162,6 +163,8 @@ class GraphRepository(ABC):
                     subject=concat_namespace(c.package, vn), predicate=GraphKeyword.HAS_TYPE_DESC, object_=vt
                 )
             for fn, desc in c.methods.items():
+                if "</I>" in desc and "<I>" not in desc:
+                    logger.error(desc)
                 # class -> function
                 await graph_db.insert(
                     subject=c.package,
diff --git a/tests/conftest.py b/tests/conftest.py
index d88b31ce5..4caecc8ee 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -9,6 +9,7 @@
 import asyncio
 import logging
 import re
+import uuid
 from unittest.mock import Mock
 
 import pytest
@@ -90,9 +91,9 @@ def loguru_caplog(caplog):
 
 
 # init & dispose git repo
-@pytest.fixture(scope="session", autouse=True)
+@pytest.fixture(scope="function", autouse=True)
 def setup_and_teardown_git_repo(request):
-    CONFIG.git_repo = GitRepository(local_path=DEFAULT_WORKSPACE_ROOT / "unittest")
+    CONFIG.git_repo = GitRepository(local_path=DEFAULT_WORKSPACE_ROOT / f"unittest/{uuid.uuid4().hex}")
     CONFIG.git_reinit = True
 
     # Destroy git repo at the end of the test session.
diff --git a/tests/metagpt/actions/test_rebuild_class_view.py b/tests/metagpt/actions/test_rebuild_class_view.py
index 941a32a3d..0103e9d05 100644
--- a/tests/metagpt/actions/test_rebuild_class_view.py
+++ b/tests/metagpt/actions/test_rebuild_class_view.py
@@ -11,6 +11,8 @@ from pathlib import Path
 import pytest
 
 from metagpt.actions.rebuild_class_view import RebuildClassView
+from metagpt.config import CONFIG
+from metagpt.const import GRAPH_REPO_FILE_REPO
 from metagpt.llm import LLM
 
 
@@ -20,6 +22,8 @@ async def test_rebuild():
         name="RedBean", context=str(Path(__file__).parent.parent.parent.parent / "metagpt"), llm=LLM()
     )
     await action.run()
+    graph_file_repo = CONFIG.git_repo.new_file_repository(relative_path=GRAPH_REPO_FILE_REPO)
+    assert graph_file_repo.changed_files
 
 
 if __name__ == "__main__":
diff --git a/tests/metagpt/test_schema.py b/tests/metagpt/test_schema.py
index 816c186e2..b6e334fbe 100644
--- a/tests/metagpt/test_schema.py
+++ b/tests/metagpt/test_schema.py
@@ -19,6 +19,9 @@ from metagpt.config import CONFIG
 from metagpt.const import SYSTEM_DESIGN_FILE_REPO, TASK_FILE_REPO
 from metagpt.schema import (
     AIMessage,
+    ClassAttribute,
+    ClassMethod,
+    ClassView,
     CodeSummarizeContext,
     Document,
     Message,
@@ -156,5 +159,30 @@ def test_CodeSummarizeContext(file_list, want):
     assert want in m
 
 
+def test_class_view():
+    attr_a = ClassAttribute(name="a", value_type="int", default_value="0", visibility="+", abstraction=True)
+    assert attr_a.get_mermaid(align=1) == "\t+int a=0*"
+    attr_b = ClassAttribute(name="b", value_type="str", default_value="0", visibility="#", static=True)
+    assert attr_b.get_mermaid(align=0) == '#str b="0"$'
+    class_view = ClassView(name="A")
+    class_view.attributes = [attr_a, attr_b]
+
+    method_a = ClassMethod(name="run", visibility="+", abstraction=True)
+    assert method_a.get_mermaid(align=1) == "\t+run()*"
+    method_b = ClassMethod(
+        name="_test",
+        visibility="#",
+        static=True,
+        args=[ClassAttribute(name="a", value_type="str"), ClassAttribute(name="b", value_type="int")],
+        return_type="str",
+    )
+    assert method_b.get_mermaid(align=0) == "#_test(str a,int b):str$"
+    class_view.methods = [method_a, method_b]
+    assert (
+        class_view.get_mermaid(align=0)
+        == 'class A{\n\t+int a=0*\n\t#str b="0"$\n\t+run()*\n\t#_test(str a,int b):str$\n}\n'
+    )
+
+
 if __name__ == "__main__":
     pytest.main([__file__, "-s"])
diff --git a/tests/metagpt/utils/test_common.py b/tests/metagpt/utils/test_common.py
index 0342a92af..9b1fa878e 100644
--- a/tests/metagpt/utils/test_common.py
+++ b/tests/metagpt/utils/test_common.py
@@ -36,6 +36,7 @@ from metagpt.utils.common import (
     read_file_block,
     read_json_file,
     require_python_version,
+    split_namespace,
 )
 
 
@@ -163,6 +164,23 @@ class TestGetProjectRoot:
         assert concat_namespace("a", "b", "c", "e") == "a:b:c:e"
         assert concat_namespace("a", "b", "c", "e", "f") == "a:b:c:e:f"
 
+    @pytest.mark.parametrize(
+        ("val", "want"),
+        [
+            (
+                "tests/metagpt/test_role.py:test_react:Input:subscription",
+                ["tests/metagpt/test_role.py", "test_react", "Input", "subscription"],
+            ),
+            (
+                "tests/metagpt/test_role.py:test_react:Input:goal",
+                ["tests/metagpt/test_role.py", "test_react", "Input", "goal"],
+            ),
+        ],
+    )
+    def test_split_namespace(self, val, want):
+        res = split_namespace(val)
+        assert res == want
+
     def test_read_json_file(self):
         assert read_json_file(str(Path(__file__).parent / "../../data/ut_writer/yft_swaggerApi.json"), encoding="utf-8")
         with pytest.raises(FileNotFoundError):