diff --git a/main.py b/main.py
index fb8b2ac..4797e69 100644
--- a/main.py
+++ b/main.py
@@ -245,8 +245,8 @@ def cmd_str():
     # 4. 初始化设备ID（network_manager 内部会自动设置 device_id 和 password）
     network_manager.read_device_id()
 
-    # 5. 创建照片存储目录（如果启用图像保存）
-    if config.SAVE_IMAGE_ENABLED:
+    # 5. 创建照片存储目录（如果启用图像保存或检测失败时强制保存）
+    if config.SAVE_IMAGE_ENABLED or getattr(config, "SAVE_IMAGE_ON_FAILURE", False):
         photo_dir = config.PHOTO_DIR
         if photo_dir not in os.listdir("/root"):
             try:
@@ -278,6 +278,12 @@ def cmd_str():
         logger.info("系统准备完成...")
 
     last_adc_trigger = 0
+    # 读取一次ADC初始值，防止开机时传感器已有压力导致误触发
+    try:
+        last_adc_val = hardware_manager.adc_obj.read()
+    except Exception:
+        last_adc_val = 0
+    peak_adc_val = 0  # 当前周期内的压力峰值
     # 气压采样：减少日志频率（每 N 个点输出一条），避免 logger.debug 拖慢采样
     PRESSURE_BATCH_SIZE = 100
 
@@ -367,15 +373,21 @@ def cmd_str():
                 pressure_max = adc_val
             if len(pressure_buf) >= PRESSURE_BATCH_SIZE:
                 _flush_pressure_buf("batch")
-            # if adc_val >= 2000:
-            # print(f"adc :{adc_val}")
-            if adc_val >= config.ADC_TRIGGER_THRESHOLD:
+            # 峰值检测：压力从峰值下降时触发，确保捕获到最大冲击时刻
+            if adc_val > peak_adc_val:
+                peak_adc_val = adc_val  # 更新峰值
+            if (peak_adc_val >= config.ADC_TRIGGER_THRESHOLD
+                    and adc_val < peak_adc_val
+                    and last_adc_val >= peak_adc_val):
+                # 封顶后下降沿触发：peak是最大值，当前值开始下降，且上次值还在peak位置
                 hardware_manager.start_idle_timer()  # 重新计时
                 diff_ms = current_time - last_adc_trigger
                 if diff_ms < 3000:
-                    logger.info(f"[MAIN] 扳机触发过于频繁, {diff_ms}ms")
+                    peak_adc_val = 0  # 去抖期间重置峰值
+                    time.sleep_ms(5)
                     continue
                 last_adc_trigger = current_time
+                peak_adc_val = 0  # 触发后重置峰值
                 # 触发前先把缓存刷出来，避免波形被长耗时处理截断
                 _flush_pressure_buf("before_trigger")
 
@@ -396,6 +408,7 @@ def cmd_str():
                     except Exception as e:
                         pass
                 time.sleep_ms(5)
+            last_adc_val = adc_val
 
         except Exception as e:
             # 主循环的顶层异常捕获，防止程序静默退出
diff --git a/shoot_manager.py b/shoot_manager.py
index d94a214..d788fa0 100644
--- a/shoot_manager.py
+++ b/shoot_manager.py
@@ -520,6 +520,7 @@ def process_shot(adc_val):
             laser_manager.flash_laser(config.FLASH_LASER_DURATION_MS)
 
         # 保存图像（异步队列，与 main.py 一致）
+        _force_save = (dx is None and dy is None) and getattr(config, "SAVE_IMAGE_ON_FAILURE", False)
         enqueue_save_shot(
             result_img,
             center,
@@ -529,8 +530,9 @@ def process_shot(adc_val):
             (x, y),
             distance_m,
             shot_id=shot_id,
-            photo_dir=config.PHOTO_DIR if config.SAVE_IMAGE_ENABLED else None,
+            photo_dir=config.PHOTO_DIR if (config.SAVE_IMAGE_ENABLED or _force_save) else None,
             yolo_roi_xyxy=yolo_roi_xyxy if draw_yolo_roi else None,
+            force_save=_force_save,
         )
 
         if logger:
diff --git a/test/test_decect_circle_v4.py b/test/test_decect_circle_v4.py
index 9f92c84..d4a1d5a 100644
--- a/test/test_decect_circle_v4.py
+++ b/test/test_decect_circle_v4.py
@@ -154,11 +154,11 @@ def detect_circle_v3(frame, laser_point=None):
                                     max_r = max(red_radius, yellow_radius)
                                     size_ratio = min_r / max_r if max_r > 0 else 0
                                     print(f"Debug -> 圆心距={distance:.1f}(阈值={max_distance:.1f}), "
-                                          f"大小比={size_ratio:.2f}(阈值=0.5), "
-                                          f"距离OK={distance < max_distance}, 大小OK={size_ratio > 0.5}")
+                                          f"大小比={size_ratio:.2f}(阈值=0.4), "
+                                          f"距离OK={distance < max_distance}, 大小OK={size_ratio >= 0.4}")
 
                                     # 允许红圈在黄圈外侧或内侧，只要大小相近（较小/较大 >= 0.5）
-                                    if distance < max_distance and size_ratio > 0.5:
+                                    if distance < max_distance and size_ratio >= 0.4:
                                         found_valid_red = True
                                         print(
                                             f"[target] -> 找到匹配的红圈: 黄心({yellow_center}), 红心({red_center}), 距离:{distance:.1f}, 黄半径:{yellow_radius}, 红半径:{red_radius}")
@@ -598,7 +598,7 @@ if __name__ == "__main__":
 
     # 1. 设置要测试的图片路径
     # 建议将图片放在与脚本同级目录，或者使用绝对路径
-    TARGET_IMAGE = "/root/phot/None_314_258_0_0041.bmp"
+    TARGET_IMAGE = "/root/phot/shot_1830921_0_no_target.jpg"
 
     TARGET_DIR = "/root/phot"  # 修改为你想要读取的目录路径