diff --git a/README.md b/README.md
index b0f81e1..c0967d5 100644
--- a/README.md
+++ b/README.md
@@ -486,7 +486,7 @@ curl -X POST http://127.0.0.1:8010/memories/search \
   -d '{
     "user_id": "u_123",
     "user_key": "uk_xxx",
-    "conversation_id": "c_456",
+    "session_id": "chat:c_456",
     "query": "图片里的蓝色圆形在哪里？",
     "scope": ["current_chat", "resources"],
     "method": "hybrid",
@@ -502,7 +502,7 @@ curl -X POST http://127.0.0.1:8010/memories/search \
 
 | scope | 行为 |
 |---|---|
-| `current_chat` | 搜索 `chat:{conversation_id}`，需要传 `conversation_id` |
+| `current_chat` | 搜索指定聊天 session，推荐传完整 `session_id`，如 `chat:c_456`；也兼容旧字段 `conversation_id`，会转换为 `chat:{conversation_id}` |
 | `resources` | 搜索当前用户已提取且未删除的资源 session |
 | `all_user_memory` | 搜索用户全部记忆，不加 session 过滤 |
 
diff --git a/core/api.py b/core/api.py
index baec889..806366c 100644
--- a/core/api.py
+++ b/core/api.py
@@ -10,7 +10,7 @@ from urllib.parse import parse_qsl, quote, urlsplit, urlunsplit
 import httpx
 from fastapi import APIRouter, FastAPI, File, Form, HTTPException, Request, UploadFile
 from pydantic import ValidationError
-from pydantic import BaseModel, Field, field_validator
+from pydantic import BaseModel, Field, field_validator, model_validator
 from starlette.datastructures import UploadFile as StarletteUploadFile
 from starlette.responses import Response
 
@@ -43,6 +43,7 @@ class SearchMemoriesRequest(BaseModel):
     user_id: str = Field(min_length=1)
     user_key: str = Field(min_length=1)
     agent_id: str | None = Field(default=None, min_length=1)
+    session_id: str | None = Field(default=None, min_length=1)
     conversation_id: str | None = None
     query: str = Field(min_length=1)
     scope: list[Literal["current_chat", "resources", "all_user_memory"]] = Field(
@@ -64,6 +65,16 @@ class SearchMemoriesRequest(BaseModel):
             raise ValueError("top_k must be -1 or in 1..100")
         return value
 
+    @model_validator(mode="after")
+    def validate_current_chat_session_aliases(self) -> SearchMemoriesRequest:
+        if self.session_id and self.conversation_id:
+            expected_session_id = f"chat:{self.conversation_id}"
+            if self.session_id != expected_session_id:
+                raise ValueError(
+                    "session_id must match chat:{conversation_id} when both are provided"
+                )
+        return self
+
 
 class AddMemoryMessage(BaseModel):
     sender_id: str = Field(min_length=1)
@@ -487,6 +498,7 @@ def create_app(
             user_id=request.user_id,
             agent_id=request.agent_id,
             query=request.query,
+            session_id=request.session_id,
             conversation_id=request.conversation_id,
             scope=request.scope,
             method=request.method,
diff --git a/core/service.py b/core/service.py
index cebbce8..3169334 100644
--- a/core/service.py
+++ b/core/service.py
@@ -502,6 +502,7 @@ class MemoryGatewayService:
         user_id: str,
         agent_id: str | None,
         query: str,
+        session_id: str | None,
         conversation_id: str | None,
         scope: list[str],
         method: str,
@@ -515,8 +516,11 @@ class MemoryGatewayService:
     ) -> dict[str, Any]:
         results: list[dict[str, Any]] = []
         session_resource_map: dict[str, dict[str, Any]] = {}
+        current_chat_session_id = session_id
+        if current_chat_session_id is None and conversation_id:
+            current_chat_session_id = f"chat:{conversation_id}"
 
-        if "current_chat" in scope and conversation_id:
+        if "current_chat" in scope and current_chat_session_id:
             payload = self._search_payload(
                 user_id=user_id,
                 agent_id=agent_id,
@@ -530,7 +534,7 @@ class MemoryGatewayService:
                 project_id=project_id,
                 filters=_combine_filters(
                     filters,
-                    {"session_id": f"chat:{conversation_id}"},
+                    {"session_id": current_chat_session_id},
                 ),
             )
             results.extend(
diff --git a/tests/test_gateway.py b/tests/test_gateway.py
index 47d7b54..41e141a 100644
--- a/tests/test_gateway.py
+++ b/tests/test_gateway.py
@@ -1181,6 +1181,63 @@ async def test_search_rejects_invalid_upstream_options(
     assert backend.search_calls == []
 
 
+@pytest.mark.asyncio
+async def test_search_current_chat_accepts_session_id(
+    config: GatewayConfig,
+) -> None:
+    backend = FakeBackendClient()
+    async with app_client(config, backend) as client:
+        user_key = await create_user(client)
+        response = await client.post(
+            "/memories/search",
+            json={
+                "user_id": "u_123",
+                "user_key": user_key,
+                "session_id": "chat:c_1",
+                "query": "hello",
+                "scope": ["current_chat"],
+            },
+        )
+
+    assert response.status_code == 200, response.text
+    assert backend.search_calls == [
+        {
+            "user_id": "u_123",
+            "query": "hello",
+            "method": "hybrid",
+            "top_k": 8,
+            "include_profile": True,
+            "enable_llm_rerank": True,
+            "app_id": "default",
+            "project_id": "default",
+            "filters": {"session_id": "chat:c_1"},
+        }
+    ]
+
+
+@pytest.mark.asyncio
+async def test_search_rejects_conflicting_session_and_conversation_ids(
+    config: GatewayConfig,
+) -> None:
+    backend = FakeBackendClient()
+    async with app_client(config, backend) as client:
+        user_key = await create_user(client)
+        response = await client.post(
+            "/memories/search",
+            json={
+                "user_id": "u_123",
+                "user_key": user_key,
+                "session_id": "chat:c_1",
+                "conversation_id": "c_2",
+                "query": "hello",
+                "scope": ["current_chat"],
+            },
+        )
+
+    assert response.status_code == 422, response.text
+    assert backend.search_calls == []
+
+
 @pytest.mark.asyncio
 async def test_search_combines_custom_and_scope_filters(
     config: GatewayConfig,