diff --git a/app/agent/callback/__init__.py b/app/agent/callback/__init__.py
index 8669792a0..4cf840d97 100644
--- a/app/agent/callback/__init__.py
+++ b/app/agent/callback/__init__.py
@@ -1,6 +1,7 @@
 import asyncio
 import re
 import threading
+import time
 from typing import Any, Optional, Tuple
 
 from app.agent.policy.sanitizer import sanitize_for_host
@@ -84,6 +85,44 @@ class StreamingHandler:
         self._live_tool_stats: dict[str, dict[str, Any]] = {}
         # 本轮已写入缓冲区的工具展示行，供 Telegram 富文本渲染时做区分样式
         self._tool_summaries: set[str] = set()
+        # 当前模型思考状态，仅用于实时展示，不写入最终助手正文。
+        self._thinking_started_at: Optional[float] = None
+        self._thinking_active = False
+        self._thinking_status_text = ""
+
+    def thinking_started(self) -> None:
+        """开始展示模型思考状态，并记录本轮思考起始时间。"""
+        with self._lock:
+            if self._thinking_active:
+                return
+            self._thinking_started_at = time.monotonic()
+            self._thinking_active = True
+            self._thinking_status_text = self._format_thinking_status(0)
+            if self._can_stream():
+                self._buffer = self._thinking_status_text
+
+    def thinking_finished(self) -> None:
+        """结束模型思考状态，移除尚未被正文替换的状态占位文本。"""
+        with self._lock:
+            if not self._thinking_active:
+                return
+            if self._buffer == self._thinking_status_text:
+                self._buffer = ""
+            self._thinking_active = False
+            self._thinking_status_text = ""
+
+    def _format_thinking_status(self, elapsed_seconds: int) -> str:
+        """生成消息渠道可直接展示的思考状态文本。"""
+        return f"🤔 思考中 · 已用时 {max(0, elapsed_seconds)} 秒"
+
+    def _refresh_thinking_status(self) -> None:
+        """更新可编辑消息中的思考计时文本，保持正文尚未生成时也有反馈。"""
+        with self._lock:
+            if not self._thinking_active or not self._can_stream() or self._buffer != self._thinking_status_text:
+                return
+            elapsed = int(max(0.0, time.monotonic() - (self._thinking_started_at or time.monotonic())))
+            self._thinking_status_text = self._format_thinking_status(elapsed)
+            self._buffer = self._thinking_status_text
 
     def set_dispatch_policy(self, allow_dispatch_without_context: bool = False) -> None:
         """
@@ -99,6 +138,11 @@ class StreamingHandler:
         """
         with self._lock:
             emitted = token or ""
+            if emitted and self._thinking_active:
+                if self._buffer == self._thinking_status_text:
+                    self._buffer = ""
+                self._thinking_active = False
+                self._thinking_status_text = ""
 
             if self._pending_tool_stats:
                 if self._live_tool_summary:
@@ -300,6 +344,9 @@ class StreamingHandler:
         self._tool_summaries = set()
         self._live_tool_summary = None
         self._live_tool_stats = {}
+        self._thinking_started_at = None
+        self._thinking_active = False
+        self._thinking_status_text = ""
 
         # 检查渠道是否支持消息编辑，不支持则仅收集 token 到 buffer，不实时推送
         if not self._can_stream():
@@ -334,6 +381,7 @@ class StreamingHandler:
             return False, ""
 
         self._streaming_enabled = False
+        self.thinking_finished()
 
         # 取消定时任务
         await self._cancel_flush_task()
@@ -366,6 +414,9 @@ class StreamingHandler:
             self._tool_summaries = set()
             self._live_tool_summary = None
             self._live_tool_stats = {}
+            self._thinking_started_at = None
+            self._thinking_active = False
+            self._thinking_status_text = ""
             if all_sent:
                 # 所有内容已通过流式发送，清空缓冲区
                 self._buffer = ""
@@ -724,6 +775,7 @@ class StreamingHandler:
             while self._streaming_enabled:
                 await asyncio.sleep(self.FLUSH_INTERVAL)
                 if self._streaming_enabled:
+                    self._refresh_thinking_status()
                     await self._flush()
         except asyncio.CancelledError:
             pass
diff --git a/app/agent/orchestrator.py b/app/agent/orchestrator.py
index cf1779860..fa2d8998f 100644
--- a/app/agent/orchestrator.py
+++ b/app/agent/orchestrator.py
@@ -2250,7 +2250,13 @@ class MoviePilotAgent:
         return attachments
 
     @staticmethod
-    async def _stream_agent_tokens(agent, messages: dict, config: dict, on_token: Callable[[str], None]):
+    async def _stream_agent_tokens(
+        agent,
+        messages: dict,
+        config: dict,
+        on_token: Callable[[str], None],
+        stream_handler: Any = None,
+    ):
         """
         流式运行智能体，过滤工具调用token和思考内容，将模型生成的内容通过回调输出。
         :param agent: LangGraph Agent 实例
@@ -2259,6 +2265,11 @@ class MoviePilotAgent:
         :param on_token: 收到有效 token 时的回调
         """
         stripper = _ThinkTagStripper()
+        thinking_started = stream_handler
+        if thinking_started is not None:
+            start_thinking = getattr(thinking_started, "thinking_started", None)
+            if callable(start_thinking):
+                start_thinking()
 
         async for chunk in agent.astream(
             messages,
@@ -2290,6 +2301,9 @@ class MoviePilotAgent:
                     # content 可能是字符串或内容块列表，过滤掉思考类型的块
                     content = LLMHelper.extract_text_content(token.content)
                     if content:
+                        finish_thinking = getattr(thinking_started, "thinking_finished", None)
+                        if callable(finish_thinking):
+                            finish_thinking()
                         stripper.process(content, on_token)
 
         stripper.flush(on_token)
@@ -2505,6 +2519,7 @@ class MoviePilotAgent:
                     messages={"messages": input_messages},
                     config=agent_config,
                     on_token=self._handle_stream_text,
+                    stream_handler=self.stream_handler,
                 )
 
                 # 输出流式过程中可能残留的工具调用统计信息
diff --git a/app/agent/web.py b/app/agent/web.py
index f83a4d4de..f7dfcf036 100644
--- a/app/agent/web.py
+++ b/app/agent/web.py
@@ -1,5 +1,6 @@
 """WebAgent 运行时类型适配，不包含 HTTP 或 SSE 编码。"""
 
+import time
 import uuid
 from threading import Lock
 from typing import Any, Awaitable, Callable, Optional
@@ -57,6 +58,18 @@ class _WebAgentStreamingHandlerMixin:
         except Exception as error:
             logger.debug(f"Web工具生命周期回调失败: {error}")
 
+    def thinking_started(self) -> None:
+        """发布 Web SSE 的模型思考开始事件，由前端负责持续计时。"""
+        super().thinking_started()  # type: ignore[misc]
+        self._publish_tool_event({"type": "thinking", "status": "running", "started_at": int(time.time() * 1000)})
+
+    def thinking_finished(self) -> None:
+        """发布 Web SSE 的模型思考结束事件，并清理基础流式状态。"""
+        was_active = bool(getattr(self, "_thinking_active", False))
+        super().thinking_finished()  # type: ignore[misc]
+        if was_active:
+            self._publish_tool_event({"type": "thinking", "status": "done"})
+
     def tool_call_started(
         self,
         tool_name: str,
@@ -186,6 +199,9 @@ class _WebAgentStreamingHandlerMixin:
         self._msg_start_offset = 0
         self._pending_tool_stats = {}
         self._live_tool_summary = None
+        self._thinking_started_at = None
+        self._thinking_active = False
+        self._thinking_status_text = ""
 
     async def stop_streaming(self) -> tuple[bool, str]:
         """停止 Web SSE 流式状态，保留缓冲区给 Agent 收口逻辑去重。"""
diff --git a/app/application/messaging/agent.py b/app/application/messaging/agent.py
index 846478234..a637f7b3d 100644
--- a/app/application/messaging/agent.py
+++ b/app/application/messaging/agent.py
@@ -189,6 +189,9 @@ def build_web_agent_display_message(
         "content": normalized_content,
         "createdAt": int(datetime.now().timestamp() * 1000),
         "status": status,
+        "thinking": False,
+        "thinking_started_at": None,
+        "thinking_elapsed_ms": 0,
         "tools": [],
         "segments": ([{"type": "text", "content": normalized_content}] if normalized_content else []),
         "attachments": attachments or [],
@@ -458,6 +461,14 @@ def apply_web_agent_display_event(event: dict[str, Any], assistant_message: dict
             else build_legacy_web_agent_segments(assistant_message["content"], assistant_message["tools"])
         )
         assistant_message["status"] = target_message.get("status") or "done"
+    elif event_type == "thinking":
+        is_thinking = str(event.get("status") or "") == "running"
+        assistant_message["thinking"] = is_thinking
+        if is_thinking:
+            assistant_message["thinking_started_at"] = event.get("started_at")
+            assistant_message["thinking_elapsed_ms"] = 0
+        else:
+            assistant_message["thinking_elapsed_ms"] = event.get("elapsed_ms") or assistant_message.get("thinking_elapsed_ms") or 0
     elif event_type == "error":
         assistant_message["status"] = "error"
         if not assistant_message["content"]:
diff --git a/tests/test_agent_streaming_lifecycle.py b/tests/test_agent_streaming_lifecycle.py
index 6ddce47cb..87d253566 100644
--- a/tests/test_agent_streaming_lifecycle.py
+++ b/tests/test_agent_streaming_lifecycle.py
@@ -8,6 +8,21 @@ from app.agent.callback import StreamingHandler
 from app.schemas.types import NotificationChannel
 
 
+def test_thinking_status_is_replaced_by_first_answer_token() -> None:
+    """思考占位消息应在首个正文 token 到达时被移除，避免污染最终回复。"""
+    handler = StreamingHandler()
+    handler._can_stream = lambda: True
+
+    handler.thinking_started()
+    assert handler._thinking_active is True
+    assert "思考中" in handler._buffer
+
+    handler.emit("最终答案")
+
+    assert handler._thinking_active is False
+    assert handler._buffer == "最终答案"
+
+
 @pytest.mark.asyncio
 async def test_repeated_streaming_start_retains_previous_flush_owner() -> None:
     """重复启动必须先等待旧 flush owner 结束，再发布新一轮上下文。"""