diff --git a/app/agent/tools/impl/_terminal_session.py b/app/agent/tools/impl/_terminal_session.py
index 6c602471d..be57e2b7f 100644
--- a/app/agent/tools/impl/_terminal_session.py
+++ b/app/agent/tools/impl/_terminal_session.py
@@ -721,3 +721,11 @@ class _TerminalSessionManager:
 
 
 terminal_session_manager = _TerminalSessionManager()
+
+
+def get_terminal_session_manager() -> _TerminalSessionManager:
+    """返回当前进程的终端会话管理器，避免复用已完成关停的实例。"""
+    global terminal_session_manager
+    if terminal_session_manager._closed:
+        terminal_session_manager = _TerminalSessionManager()
+    return terminal_session_manager
diff --git a/app/agent/tools/impl/execute_command.py b/app/agent/tools/impl/execute_command.py
index 591ba5660..a3bc9568e 100644
--- a/app/agent/tools/impl/execute_command.py
+++ b/app/agent/tools/impl/execute_command.py
@@ -21,7 +21,7 @@ from app.agent.tools.impl._terminal_session import (
     TERMINAL_DEFAULT_READ_BYTES,
     TERMINAL_MAX_READ_BYTES,
     TERMINAL_WAIT_DEFAULT_MS,
-    terminal_session_manager,
+    get_terminal_session_manager,
 )
 from app.runtime.log import logger
 
@@ -528,6 +528,7 @@ class ExecuteCommandTool(MoviePilotTool):
         )
 
         try:
+            terminal_session_manager = get_terminal_session_manager()
             if normalized_action == "start":
                 start_command = self._require_command(command)
                 self._validate_command(