diff --git a/memory_scope/memory/operation/read_memory.py b/memory_scope/memory/operation/read_memory.py
index d647acd3..cc66b6ea 100644
--- a/memory_scope/memory/operation/read_memory.py
+++ b/memory_scope/memory/operation/read_memory.py
@@ -27,7 +27,7 @@ class ReadMemory(BaseWorkflow, BaseOperation):
 
     def run_operation(self):
         max_count = 1 + max(self.his_msg_count, self.contextual_msg_count)
-        self.context[CHAT_MESSAGES] = [x.copy() for x in self.chat_messages[-max_count:]]
+        self.context[CHAT_MESSAGES] = [x.copy(deep=True) for x in self.chat_messages[-max_count:]]
         self.run_workflow()
         result = self.context.get(RESULT)
         self.context.clear()
diff --git a/memory_scope/memory/operation/write_memory.py b/memory_scope/memory/operation/write_memory.py
index 362ec10f..0df92f0c 100644
--- a/memory_scope/memory/operation/write_memory.py
+++ b/memory_scope/memory/operation/write_memory.py
@@ -56,7 +56,7 @@ class WriteMemory(BaseWorkflow, BaseOperation):
             return
 
         max_count = not_memorized_size + self.his_msg_count
-        self.context[CHAT_MESSAGES] = [x.copy() for x in self.chat_messages[-max_count:]]
+        self.context[CHAT_MESSAGES] = [x.copy(deep=True) for x in self.chat_messages[-max_count:]]
         self.run_workflow()
         result = self.context.get(RESULT)
         self.context.clear()
diff --git a/memory_scope/memory/worker/memory_base_worker.py b/memory_scope/memory/worker/memory_base_worker.py
index f61619f9..4c0d7878 100644
--- a/memory_scope/memory/worker/memory_base_worker.py
+++ b/memory_scope/memory/worker/memory_base_worker.py
@@ -2,8 +2,11 @@ from abc import ABCMeta
 from typing import List
 
 from memory_scope.chat.global_context import G_CONTEXT
+from memory_scope.constants.common_constants import CHAT_MESSAGES
+from memory_scope.enumeration.message_role_enum import MessageRoleEnum
 from memory_scope.memory.worker.base_worker import BaseWorker
 from memory_scope.models.base_model import BaseModel
+from memory_scope.scheme.message import Message
 from memory_scope.storage.base_monitor import BaseMonitor
 from memory_scope.storage.base_vector_store import BaseVectorStore
 
@@ -24,17 +27,15 @@ class MemoryBaseWorker(BaseWorker, metaclass=ABCMeta):
         self._vector_store: BaseVectorStore | None = None
         self._monitor: BaseMonitor | None = None
 
+        self._user_id: str | None = None
+
     @property
     def messages(self) -> List[Message]:
-        return self.get_context(MESSAGES)
+        return self.get_context(CHAT_MESSAGES)
 
     @messages.setter
     def messages(self, value):
-        self.set_context(MESSAGES, value)
-
-    @property
-    def chat_name(self):
-        return self.get_context(CHAT_NAME)
+        self.set_context(CHAT_MESSAGES, value)
 
     @property
     def embedding_model(self) -> BaseModel:
@@ -67,11 +68,15 @@ class MemoryBaseWorker(BaseWorker, metaclass=ABCMeta):
         return self._monitor
 
     @property
-    def memory_id(self) -> str:
-        pass
+    def user_id(self) -> str:
+        if self._user_id is None:
+            message = [x for x in self.messages if x.role == MessageRoleEnum.USER.value][-1]
+            self._user_id = message.role_name
+        return self._user_id
 
     def __getattr__(self, key: str):
         return self.kwargs[key]
 
-    def get_prompt(self, x):
-        return x[GLOBAL_CONTEXT.global_configs["language"]]
\ No newline at end of file
+    @staticmethod
+    def get_prompt(prompt: dict) -> str:
+        return prompt[G_CONTEXT.global_configs["language"]]
diff --git a/memory_scope/scheme/memory_node.py b/memory_scope/scheme/memory_node.py
index 0c042236..e801d121 100644
--- a/memory_scope/scheme/memory_node.py
+++ b/memory_scope/scheme/memory_node.py
@@ -1,13 +1,17 @@
+import datetime
 from typing import Dict, List
 
+import
 from pydantic import Field, BaseModel
 
+from memory_scope.utils.tool_functions import md5_hash
+
 
 class MemoryNode(BaseModel):
-    user_id: str = Field("", description="unique memory id for user")
-
     memory_id: str = Field("", description="unique id for memory item")
 
+    user_id: str = Field("", description="unique memory id for user")
+
     content: str = Field("", description="memory content")
 
     score_similar: float = Field(0, description="es similar score")
@@ -24,9 +28,14 @@ class MemoryNode(BaseModel):
 
     vector: List[float] = Field([], description="content embedding result, return empty")
 
+    timestamp: int = Field(int(datetime.datetime.now().timestamp()), description="timestamp of the memory node")
+
     @property
     def node_keys(self):
         return list(self.model_json_schema()["properties"].keys())
 
     def __getitem__(self, key: str):
         return self.model_dump().get(key)
+
+    def gen_memory_id(self):
+        self.memory_id = f"{self.user_id}_{self.timestamp}_{md5_hash(self.content)[:8]}"
diff --git a/memory_scope/utils/tool_functions.py b/memory_scope/utils/tool_functions.py
index aed4aff1..11e85e7b 100644
--- a/memory_scope/utils/tool_functions.py
+++ b/memory_scope/utils/tool_functions.py
@@ -1,3 +1,4 @@
+import hashlib
 import random
 import re
 import time
@@ -113,3 +114,9 @@ def char_logo(words: str, seed: int = time.time_ns(), color=None):
             colored_line += colored_char
         colored_lines.append(colored_line)
     return colored_lines
+
+
+def md5_hash(input_string: str):
+    m = hashlib.md5()
+    m.update(input_string.encode('utf-8'))
+    return m.hexdigest()