diff --git a/app/src/app_service/ecg_service/ecg_algo.c b/app/src/app_service/ecg_service/ecg_algo.c
index a60bb31..947c404 100644
--- a/app/src/app_service/ecg_service/ecg_algo.c
+++ b/app/src/app_service/ecg_service/ecg_algo.c
@@ -6,7 +6,7 @@
 #include "algo/zsimple_qrs.h"
 #include "znordic.h"
 
-#define REPORT_MEDIAN_WINDOWS_SIZE 101  // 必须是奇数
+#define REPORT_MEDIAN_WINDOWS_SIZE 121  // 必须是奇数
 
 LPFilterExt_t    m_lp_filter;
 HPFilterExt_t    m_hp_filter;
diff --git a/app/src/app_service/ecg_service/ecg_service.c b/app/src/app_service/ecg_service/ecg_service.c
index 4798d3d..7304ab6 100644
--- a/app/src/app_service/ecg_service/ecg_service.c
+++ b/app/src/app_service/ecg_service/ecg_service.c
@@ -211,7 +211,12 @@ static void leadoff_state_process(ads129x_capture_data_t* capture_data) {
      */
     static uint32_t un_lead_off_cnt = 0;
     bool            leadoff         = false;
-    if (capture_data->ch1data > 34000 || capture_data->ch1data < -34000) {
+
+    int32_t abs_af_filter = ecg_algo_get_report_data();
+    if (abs_af_filter < 0) {
+      abs_af_filter = -abs_af_filter;
+    }
+    if (abs_af_filter < 500) {
       leadoff = true;
     }
 
@@ -221,7 +226,7 @@ static void leadoff_state_process(ads129x_capture_data_t* capture_data) {
       un_lead_off_cnt = 0;
     }
 
-    if (un_lead_off_cnt > 10) {
+    if (un_lead_off_cnt > 300) {
       un_lead_off_cnt = 0;
       m_leadoffstate  = true;
     }
@@ -231,20 +236,20 @@ static void leadoff_state_process(ads129x_capture_data_t* capture_data) {
      * @brief 导联恢复检测
      */
 
-    static uint32_t cnt = 0;
+    static uint32_t cnt           = 0;
+    int32_t         abs_af_filter = ecg_algo_get_report_data();
 
-    int32_t absraw = capture_data->ch1data;
-    if (absraw < 0) {
-      absraw = -absraw;
+    if (abs_af_filter < 0) {
+      abs_af_filter = -abs_af_filter;
     }
 
-    if (absraw < 25000) {
+    if (abs_af_filter > 1500) {
       cnt++;
     } else {
       cnt = 0;
     }
 
-    if (cnt > 3) {
+    if (cnt > 6) {
       cnt            = 0;
       m_leadoffstate = false;
     }
@@ -434,7 +439,6 @@ void ecg_service_set_in_test_mode(bool testmode) {
 void ecg_service_set_report_data_in_raw_mode(bool rawmode) { m_report_data_in_raw_mode_flag = rawmode; }
 
 bool ecg_leadoff_detect() {
-  return false;
   if (m_testmode_flag) {
     return false;
   }
diff --git a/app/src/aproject_config/config.h b/app/src/aproject_config/config.h
index 91ede93..a9d32db 100644
--- a/app/src/aproject_config/config.h
+++ b/app/src/aproject_config/config.h
@@ -7,7 +7,7 @@
 #define CATEGORY          "M1003"  // 单导联
 #define MANUFACTURER_NAME "iflytop"
 
-#define FIRMWARE_VERSION   (507)
+#define FIRMWARE_VERSION   (508)
 #define BLESTACK_VERSION   1
 #define BOOTLOADER_VERSION 1
 #define HARDWARE_VERSION   (2)