diff --git a/swe_bench/utils/enums.py b/swe_bench/utils/enums.py
new file mode 100644
index 000000000..7c052a8ff
--- /dev/null
+++ b/swe_bench/utils/enums.py
@@ -0,0 +1,12 @@
+from enum import Enum, auto
+
+
+class FileChangeMode(Enum):
+    create = auto()
+    delete = auto()
+    change = auto()
+
+
+class LineChangeType(Enum):
+    addition = auto()
+    deletion = auto()
diff --git a/swe_bench/utils/parse_diff.py b/swe_bench/utils/parse_diff.py
new file mode 100644
index 000000000..d2b32d2a1
--- /dev/null
+++ b/swe_bench/utils/parse_diff.py
@@ -0,0 +1,115 @@
+import re
+from typing import Dict, List
+
+from metagpt.logs import logger
+from swe_bench.utils.enums import FileChangeMode, LineChangeType
+
+
+def extract_changes_from_patch(diff: str) -> List[Dict[str, any]]:
+    """Parses the patch text through the standard syntax of git diff, outputs the information of added and deleted lines.
+
+    Extracts detailed information about file changes based on the output content of git diff.
+
+    Args:
+        diff: A string containing the output of git diff.
+
+    Returns:
+        A list of dictionaries containing information about each file change.
+    """
+    changes = []
+    current_file = None
+
+    file_pattern = re.compile(r"^diff --git a/(.+) b/(.+)$")
+    line_change_pattern = re.compile(r"^@@ -(\d+),\d+ \+(\d+),\d+ @@.*$")
+    new_file_flag_line = "--- /dev/null"
+    deleted_file_flag_line = "+++ /dev/null"
+
+    for line in diff.splitlines():
+        file_section_start = file_pattern.match(line)
+        if file_section_start:
+            if current_file:
+                changes.append(current_file)
+            file_a, file_b = file_section_start.groups()
+            current_file = start_new_file_section(file_a, file_b)
+            current_file["mode"] = FileChangeMode.change
+        elif current_file:
+            # 匹配到新文件模式，标记当前文件为新增
+            if line == new_file_flag_line:
+                current_file["mode"] = FileChangeMode.create
+            # 匹配到删除文件模式，标记当前文件为删除
+            elif line == deleted_file_flag_line:
+                current_file["mode"] = FileChangeMode.delete
+            update_file_changes(current_file, line, line_change_pattern)
+
+    if current_file:
+        changes.append(current_file)
+
+    return changes
+
+
+def start_new_file_section(file_before_change: str, file_after_change: str) -> Dict[str, any]:
+    """Function to initialize a new file section
+
+    When encountering a new file change, this function is called to initialize a dictionary recording the file change information.
+
+    Args:
+        file_before_change: The file name before the change
+        file_after_change: The file name after the change, or "/dev/null" if the file was deleted.
+
+    Returns:
+        A dictionary representing the file change.
+    """
+    return {
+        "file_before_change": file_before_change,
+        "file_after_change": file_after_change,
+        "changes": [],
+    }
+
+
+def update_file_changes(current_file: Dict[str, any], line: str, line_change_pattern: re.Pattern):
+    """Updates the current file change information
+
+    Updates the current file's change record based on a line from the diff.
+
+    Args:
+        current_file: The current file information being processed
+        line: The current line from the diff
+        line_change_pattern: The regex pattern used to identify line changes
+    """
+    line_change_match = line_change_pattern.match(line)
+    if line_change_match:
+        current_file["base_line"], current_file["changed_line"] = map(int, line_change_match.groups())
+    elif line.startswith("+"):
+        current_file["changes"].append(
+            {"type": LineChangeType.addition, "line": current_file.get("changed_line", 1), "content": line[1:]}
+        )
+        current_file["changed_line"] = current_file.get("changed_line", 0) + 1
+    elif line.startswith("-"):
+        current_file["changes"].append(
+            {"type": LineChangeType.deletion, "line": current_file.get("base_line", 1), "content": line[1:]}
+        )
+        current_file["base_line"] = current_file.get("base_line", 0) + 1
+
+
+def filter_changed_line(patch):
+    """Filters changed lines
+
+    Filters the part of the change record of the current file that needs to be used.
+
+    Args:
+        patch: The git diff text
+    """
+    parsed_changes = extract_changes_from_patch(patch)
+    res = {}
+    for change in parsed_changes:
+        file_name = change["file_before_change"]
+        res[file_name] = []
+        # 新增的文件略过
+        if change["mode"] is FileChangeMode.create:
+            continue
+        for c in change["changes"]:
+            if c["type"] is LineChangeType.addition:
+                continue
+            logger.debug(f"  {c['type']} at line {c['line']}: {c['content']}")
+            res[file_name].append(c)
+    return res