diff --git a/README.md b/README.md
index c5fcd93ce..cb464b9cd 100644
--- a/README.md
+++ b/README.md
@@ -53,8 +53,8 @@ Designed for **AI companions, role-playing NPCs, and multi-agent systems**, MemO
 </div>
 
 
-Get Free API: [Try API](https://memos-dashboard.openmem.net/quickstart/?source=github) 
- 
+Get Free API: [Try API](https://memos-dashboard.openmem.net/quickstart/?source=github)
+
 
 ---
 
diff --git a/evaluation/.env-example b/evaluation/.env-example
index 5381532c2..bab6f679e 100644
--- a/evaluation/.env-example
+++ b/evaluation/.env-example
@@ -21,4 +21,3 @@ MEMU_API_KEY="mu_xxx"
 SUPERMEMORY_API_KEY="sm_xxx"
 MEMOBASE_API_KEY="xxx"
 MEMOBASE_PROJECT_URL="http://***.***.***.***:8019"
-
diff --git a/src/memos/api/routers/server_router.py b/src/memos/api/routers/server_router.py
index 8df383bfb..23aec0cb0 100644
--- a/src/memos/api/routers/server_router.py
+++ b/src/memos/api/routers/server_router.py
@@ -187,7 +187,11 @@ def init_server():
 
     # Create component instances
     graph_db = GraphStoreFactory.from_config(graph_db_config)
-    vector_db = VecDBFactory.from_config(vector_db_config)
+    vector_db = (
+        VecDBFactory.from_config(vector_db_config)
+        if os.getenv("ENABLE_PREFERENCE_MEMORY", "false").lower() == "true"
+        else None
+    )
     llm = LLMFactory.from_config(llm_config)
     embedder = EmbedderFactory.from_config(embedder_config)
     mem_reader = MemReaderFactory.from_config(mem_reader_config)
@@ -195,24 +199,36 @@ def init_server():
     internet_retriever = InternetRetrieverFactory.from_config(
         internet_retriever_config, embedder=embedder
     )
-    pref_extractor = ExtractorFactory.from_config(
-        config_factory=pref_extractor_config,
-        llm_provider=llm,
-        embedder=embedder,
-        vector_db=vector_db,
+    pref_extractor = (
+        ExtractorFactory.from_config(
+            config_factory=pref_extractor_config,
+            llm_provider=llm,
+            embedder=embedder,
+            vector_db=vector_db,
+        )
+        if os.getenv("ENABLE_PREFERENCE_MEMORY", "false").lower() == "true"
+        else None
     )
-    pref_adder = AdderFactory.from_config(
-        config_factory=pref_adder_config,
-        llm_provider=llm,
-        embedder=embedder,
-        vector_db=vector_db,
+    pref_adder = (
+        AdderFactory.from_config(
+            config_factory=pref_adder_config,
+            llm_provider=llm,
+            embedder=embedder,
+            vector_db=vector_db,
+        )
+        if os.getenv("ENABLE_PREFERENCE_MEMORY", "false").lower() == "true"
+        else None
     )
-    pref_retriever = RetrieverFactory.from_config(
-        config_factory=pref_retriever_config,
-        llm_provider=llm,
-        embedder=embedder,
-        reranker=reranker,
-        vector_db=vector_db,
+    pref_retriever = (
+        RetrieverFactory.from_config(
+            config_factory=pref_retriever_config,
+            llm_provider=llm,
+            embedder=embedder,
+            reranker=reranker,
+            vector_db=vector_db,
+        )
+        if os.getenv("ENABLE_PREFERENCE_MEMORY", "false").lower() == "true"
+        else None
     )
 
     # Initialize memory manager
diff --git a/src/memos/mem_cube/navie.py b/src/memos/mem_cube/navie.py
index ba9f136b7..3acc441a0 100644
--- a/src/memos/mem_cube/navie.py
+++ b/src/memos/mem_cube/navie.py
@@ -58,14 +58,18 @@ def __init__(
         )
         self._act_mem: BaseActMemory | None = None
         self._para_mem: BaseParaMemory | None = None
-        self._pref_mem: BaseTextMemory | None = SimplePreferenceTextMemory(
-            extractor_llm=llm,
-            vector_db=vector_db,
-            embedder=embedder,
-            reranker=reranker,
-            extractor=pref_extractor,
-            adder=pref_adder,
-            retriever=pref_retriever,
+        self._pref_mem: BaseTextMemory | None = (
+            SimplePreferenceTextMemory(
+                extractor_llm=llm,
+                vector_db=vector_db,
+                embedder=embedder,
+                reranker=reranker,
+                extractor=pref_extractor,
+                adder=pref_adder,
+                retriever=pref_retriever,
+            )
+            if os.getenv("ENABLE_PREFERENCE_MEMORY", "false").lower() == "true"
+            else None
         )
 
     def load(