diff --git a/CHANGELOG.md b/CHANGELOG.md
index 915c566..d45d22d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@
 
 - **`build_companion_prompt()` 未标记已注入**：读取 uninjected ruminations 后调用 `mark_injected(ids)`，避免重复注入
 - **`scheduler/tasks.py` 导入路径错误**：`from .engine.context_injection` → `from ..engine.context_injection`
+- **SAN 白名单私聊 scope**：SAN 群分析会跳过 `private_` scope，避免将私聊 ID 当作群号解析
 
 #### Changed
 
diff --git a/cognition/san.py b/cognition/san.py
index 4b5bbc8..46fbc8f 100644
--- a/cognition/san.py
+++ b/cognition/san.py
@@ -194,8 +194,9 @@ async def _get_listened_groups(self):
         # 方式1: 白名单配置
         whitelist = self.plugin.cfg.target_scopes
         if whitelist:
-            logger.debug(f"[SAN] 使用白名单群列表: {whitelist}")
-            return whitelist
+            groups = [g for g in whitelist if not str(g).startswith("private_")]
+            logger.debug(f"[SAN] 使用白名单群列表 (已过滤私聊): {groups}")
+            return groups
         # 方式2: eavesdropping get_active_scopes()
         eavesdropping = getattr(self.plugin, "eavesdropping", None)
         if eavesdropping and hasattr(eavesdropping, "get_active_scopes"):
@@ -249,6 +250,9 @@ async def _analyze_group(self, group_id: str) -> dict | None:
 
     async def _fetch_group_messages(self, group_id: str) -> list:
         """通过 NapCat API 获取群消息"""
+        if not group_id or str(group_id).startswith("private_"):
+            logger.debug(f"[SAN] 忽略私聊会话消息获取: {group_id}")
+            return []
         try:
             platform_insts = self.plugin.context.platform_manager.platform_insts
             if not platform_insts:
diff --git a/tests/test_san.py b/tests/test_san.py
index 62ad5f2..9d6f9c6 100644
--- a/tests/test_san.py
+++ b/tests/test_san.py
@@ -11,6 +11,29 @@
 
 
 class SANSystemTests(IsolatedAsyncioTestCase):
+    async def test_get_listened_groups_filters_private_scopes_from_whitelist(self):
+        plugin = SimpleNamespace(
+            cfg=SimpleNamespace(target_scopes=["7001", "private_1001", "7002"]),
+        )
+        san = SANSystem(plugin)
+
+        groups = await san._get_listened_groups()
+
+        self.assertEqual(groups, ["7001", "7002"])
+
+    async def test_fetch_group_messages_ignores_private_scope_without_bot_call(self):
+        bot = SimpleNamespace(call_action=AsyncMock())
+        plugin = SimpleNamespace(
+            cfg=SimpleNamespace(san_msg_count_per_group=50),
+            context=SimpleNamespace(platform_manager=SimpleNamespace(platform_insts=[SimpleNamespace(get_client=lambda: bot)])),
+        )
+        san = SANSystem(plugin)
+
+        messages = await san._fetch_group_messages("private_1001")
+
+        self.assertEqual(messages, [])
+        bot.call_action.assert_not_called()
+
     async def test_llm_analyze_uses_group_umo_for_provider_lookup(self):
         provider = SimpleNamespace(
             text_chat=AsyncMock(