diff --git a/metagpt/memory/memory.py b/metagpt/memory/memory.py
index d964cc1dc..e9891ed00 100644
--- a/metagpt/memory/memory.py
+++ b/metagpt/memory/memory.py
@@ -129,11 +129,3 @@ class Memory(BaseModel):
                 continue
             rsp += self.index[action]
         return rsp
-
-    def get_by_tags(self, tags: list) -> list[Message]:
-        """Return messages with specified tags"""
-        result = []
-        for m in self.storage:
-            if m.is_contain_tags(tags):
-                result.append(m)
-        return result
diff --git a/tests/metagpt/memory/test_memory.py b/tests/metagpt/memory/test_memory.py
new file mode 100644
index 000000000..36d7ad488
--- /dev/null
+++ b/tests/metagpt/memory/test_memory.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @Desc   : the unittest of Memory
+
+from metagpt.actions import UserRequirement
+from metagpt.memory.memory import Memory
+from metagpt.schema import Message
+
+
+def test_memory():
+    memory = Memory()
+
+    message1 = Message(content="test message1", role="user1")
+    message2 = Message(content="test message2", role="user2")
+    message3 = Message(content="test message3", role="user1")
+    memory.add(message1)
+    assert memory.count() == 1
+
+    memory.delete_newest()
+    assert memory.count() == 0
+
+    memory.add_batch([message1, message2])
+    assert memory.count() == 2
+    assert len(memory.index.get(message1.cause_by)) == 2
+
+    messages = memory.get_by_role("user1")
+    assert messages[0].content == message1.content
+
+    messages = memory.get_by_content("test message")
+    assert len(messages) == 2
+
+    messages = memory.get_by_action(UserRequirement)
+    assert len(messages) == 2
+
+    messages = memory.get_by_actions([UserRequirement])
+    assert len(messages) == 2
+
+    messages = memory.try_remember("test message")
+    assert len(messages) == 2
+
+    messages = memory.get(k=1)
+    assert len(messages) == 1
+
+    messages = memory.get(k=5)
+    assert len(messages) == 2
+
+    messages = memory.find_news([message3])
+    assert len(messages) == 1
+
+    memory.delete(message1)
+    assert memory.count() == 1
+    messages = memory.get_by_role("user2")
+    assert messages[0].content == message2.content
+
+    memory.clear()
+    assert memory.count() == 0
+    assert len(memory.index) == 0