diff --git a/biz/checkpoint/checkpoint_biz.py b/biz/checkpoint/checkpoint_biz.py
index f61ccd2..13d88b9 100644
--- a/biz/checkpoint/checkpoint_biz.py
+++ b/biz/checkpoint/checkpoint_biz.py
@@ -455,13 +455,17 @@ class KadianDetector:
         for k in expired_only_one:
             del self.only_one_alerts[k]
 
-        # 更新累计帧数
-        if effective_police_count == 0:
-            self.nobody_frames += 1
-            self.only_one_frames = 0
-        elif effective_police_count == 1:
-            self.only_one_frames += 1
-            self.nobody_frames = 0
+        if effective_car_count > 0:
+            # 更新累计帧数
+            if effective_police_count == 0:
+                self.nobody_frames += 1
+                self.only_one_frames = 0
+            elif effective_police_count == 1:
+                self.only_one_frames += 1
+                self.nobody_frames = 0
+            else:
+                self.nobody_frames = 0
+                self.only_one_frames = 0
         else:
             self.nobody_frames = 0
             self.only_one_frames = 0
@@ -474,7 +478,7 @@ class KadianDetector:
                     'time': current_time_sec,
                     'action': "Nobody",
                 })
-                self.draw_alert(frame, alert_text, (0, 0, 255), offset_y=alert_offset)
+                # self.draw_alert(frame, alert_text, (0, 0, 255), offset_y=alert_offset)
                 alert_offset += 100
         elif effective_police_count == 1 and self.only_one_frames >= self.frame_thresh_only_one:
             alert_text = "Only One"
@@ -484,7 +488,7 @@ class KadianDetector:
                     'time': current_time_sec,
                     'action': "Only One",
                 })
-                self.draw_alert(frame, alert_text, (255, 165, 0), offset_y=alert_offset)
+                # self.draw_alert(frame, alert_text, (255, 165, 0), offset_y=alert_offset)
                 alert_offset += 100
 
         return {