diff --git a/HealthMonitor.Service/Biz/db/TDengineService.cs b/HealthMonitor.Service/Biz/db/TDengineService.cs
index 042958e..8841425 100644
--- a/HealthMonitor.Service/Biz/db/TDengineService.cs
+++ b/HealthMonitor.Service/Biz/db/TDengineService.cs
@@ -1365,12 +1365,13 @@ namespace HealthMonitor.Service.Biz.db
                 // 触发高频监测的心率下限值
                 var triggerHighFreqLow = (int)watchConfig["triggerHighFreqLow"]!;
                 //增量系数 = (正常胎心最大值 - 正常胎心最小值) / (阀值最大值 - 阀值最小值)
-                var coefficient = (NormaletalHeartRateMax - NormaletalHeartRateMin) / (triggerHighFreqHigh - triggerHighFreqLow);
+                var coefficient = (double)(NormaletalHeartRateMax - NormaletalHeartRateMin)! / (triggerHighFreqHigh - triggerHighFreqLow);
+
 
                 //胎心值 = 正常胎心最小值 + 增量系数 * (心率值 - 阀值最小值)
                 var fetalHeartRate = NormaletalHeartRateMin + coefficient * (heartrateValue - triggerHighFreqLow);
 
-                _logger.LogInformation($"{serialNo} 孕周：{pregnancyWeek}， 正常胎心最大值：{NormaletalHeartRateMax}，正常胎心最小值：{NormaletalHeartRateMin}，阀值最大值：{triggerHighFreqHigh} ,阀值最小值：{triggerHighFreqLow}, 增量系数:{coefficient}");
+                _logger.LogInformation($"{serialNo} 孕周：{pregnancyWeek}， 正常胎心最大值：{NormaletalHeartRateMax}，正常胎心最小值：{NormaletalHeartRateMin}，阀值最大值：{triggerHighFreqHigh} ,阀值最小值：{triggerHighFreqLow}, 本次增量系数:{coefficient},本次心率值：{heartrateValue}");
                 return SafeType.SafeInt(fetalHeartRate!);
             }