diff --git a/gradio_ui.py b/gradio_ui.py
index e4d07c2..9182cb7 100644
--- a/gradio_ui.py
+++ b/gradio_ui.py
@@ -100,26 +100,21 @@ def run_eval(
 def stop_eval():
     global current_process, should_stop
     should_stop = True
-    killed = []
 
-    try:
-        for proc in psutil.process_iter(["pid", "name", "cmdline"]):
-            try:
-                cmdline = proc.info["cmdline"]
-                if cmdline and "evalscope" in " ".join(cmdline):
-                    killed.append(proc.pid)
-                    proc.kill()
-            except (psutil.NoSuchProcess, psutil.AccessDenied):
-                continue
-
-        if killed:
+    if current_process and current_process.poll() is None:
+        try:
+            pgid = os.getpgid(current_process.pid)
+            os.killpg(pgid, signal.SIGINT)  # ✅ 优雅终止
+            time.sleep(2)
+            if current_process.poll() is None:
+                os.killpg(pgid, signal.SIGKILL)  # ❗ 强制终止
+            return "[✅ 已发送终止信号 (SIGINT → SIGKILL fallback)]\n"
+        except Exception as e:
+            return f"[❌ 终止失败: {e}]\n"
+        finally:
             current_process = None
-            return f"[✅ 强制终止 evalscope PIDs: {killed}]\n"
-        else:
-            return "[⚠️ 未发现可杀的 evalscope 进程]\n"
-
-    except Exception as e:
-        return f"[❌ 停止失败: {e}]\n"
+    else:
+        return "[⚠️ 无活动 evalscope 进程]\n"