diff --git a/HealthMonitor.Service/Biz/db/TDengineService.cs b/HealthMonitor.Service/Biz/db/TDengineService.cs
index 4fa8009..a7521c1 100644
--- a/HealthMonitor.Service/Biz/db/TDengineService.cs
+++ b/HealthMonitor.Service/Biz/db/TDengineService.cs
@@ -1021,35 +1021,10 @@ namespace HealthMonitor.Service.Biz.db
                .Where(i => i.SerialNumber.Equals(serialNo))
                .Where(i => i.LastUpdate > daysAgo)
                .OrderByDescending(i => i.LastUpdate)
-               .ToArrayAsync();
+               .ToListAsync();
 
             // 去除高频数据
-            var filteredCollection = new List<PregnancyHeartRateModel>();
-            PregnancyHeartRateModel? previousItem = null;
-
-            //foreach (var item in collection)
-            //{
-            //    if (previousItem == null || Math.Abs((previousItem.LastUpdate - item.LastUpdate).TotalSeconds) >= highFreqSampleInterval)
-            //    {
-            //        filteredCollection.Add(item);
-            //        previousItem = item;
-            //    }
-            //}
-
-
-            foreach (var item in collection)
-            {
-                if (previousItem!=null)
-                {
-                    var timeDiff = (previousItem.LastUpdate - item.LastUpdate).TotalSeconds;
-                    Console.WriteLine($"previousItem:{previousItem.PregnancyHeartRate} -- item:{previousItem.PregnancyHeartRate} timeDiff:{timeDiff}--highFreqSampleInterval:{highFreqSampleInterval}");
-                    if (timeDiff >= highFreqSampleInterval)
-                    {
-                        filteredCollection.Add(item);
-                    }
-                }
-                previousItem = item;
-            }
+            var filteredCollection = GetNonFreqPregnancyHeartRate(collection, highFreqSampleInterval);
 
             // 心率数据量必须30个以上才进行计算
             if (filteredCollection.Count < 30)
@@ -1217,6 +1192,128 @@ namespace HealthMonitor.Service.Biz.db
         }
 
 
+        /// <summary>
+        ///  去除高频数据
+        /// </summary>
+        /// <param name="phr"></param>
+        /// <param name="highFreqSampleInterva"></param>
+        /// <returns></returns>
+        private static List<PregnancyHeartRateModel> GetNonFreqPregnancyHeartRate(List<PregnancyHeartRateModel> phr, int highFreqSampleInterval)
+        {
+            //phr = phr.OrderByDescending(i => i.LastUpdate).ToList();
+            //var result = new List<PregnancyHeartRateModel>();
+            //PregnancyHeartRateModel? previousItem = null;
+
+            //foreach (var item in phr)
+            //{
+            //    if (previousItem != null)
+            //    {
+            //        var timeNextDiff =(previousItem!.LastUpdate - item.LastUpdate).TotalSeconds;
+            //        if (timeNextDiff > highFreqSampleInterval)
+            //        {
+            //            result.Add(previousItem);
+            //        }
+            //    }
+            //    previousItem = item;
+            //}
+
+            //// 添加上一个
+            //if (previousItem != null)
+            //{
+            //    result.Add(previousItem);
+            //}
+
+            //return result;
+
+            #region 反向
+            var phr1 = phr.OrderByDescending(i => i.LastUpdate).ToList();
+            var result = new List<PregnancyHeartRateModel>();
+            PregnancyHeartRateModel? previousItem1 = null;
+
+            foreach (var item in phr1)
+            {
+                if (previousItem1 != null)
+                {
+                    var timeNextDiff = (previousItem1!.LastUpdate - item.LastUpdate).TotalSeconds;
+                    if (timeNextDiff > highFreqSampleInterval)
+                    {
+                        result.Add(previousItem1);
+                    }
+                }
+                previousItem1 = item;
+            }
+
+            // 添加上一个
+            if (previousItem1 != null)
+            {
+                result.Add(previousItem1);
+            }
+            #endregion
+
+            #region 正向
+            var phr2 = phr.OrderByDescending(i => i.LastUpdate).ToList(); ;
+            var freqCollection = new List<PregnancyHeartRateModel>();
+            PregnancyHeartRateModel? previousItem = null;
+            foreach (var item in phr2)
+            {
+                if (previousItem != null)
+                {
+                    var timeNextDiff = (previousItem!.LastUpdate - item.LastUpdate).TotalSeconds;
+                    if (timeNextDiff <= highFreqSampleInterval)
+                    {
+                        freqCollection.Add(item);
+                    }
+                }
+                previousItem = item;
+            }
+            //去除高频
+            foreach (var item in freqCollection)
+            {
+                phr2.Remove(item);
+            }
+            #endregion
+
+            // 交集
+            var commonElements = phr2.Intersect(result).ToList();
+            return commonElements;
+        }
+
+
+        /// <summary>
+        /// 获取高频数据
+        /// </summary>
+        /// <param name="phr"></param>
+        /// <param name="highFreqSampleInterval"></param>
+        /// <returns></returns>
+        private static List<PregnancyHeartRateModel> GetFreqPregnancyHeartRate(List<PregnancyHeartRateModel> phr, int highFreqSampleInterval)
+        {
+            phr = phr.OrderByDescending(i => i.LastUpdate).ToList();
+            var freqCollection = new List<PregnancyHeartRateModel>();
+            PregnancyHeartRateModel? previousItem = null;
+
+            foreach (var item in phr)
+            {
+                if (previousItem != null)
+                {
+                    var timeNextDiff = (previousItem.LastUpdate - item.LastUpdate).TotalSeconds;
+                    if (timeNextDiff <= highFreqSampleInterval)
+                    {
+                        freqCollection.Add(previousItem);
+                    }
+                }
+                previousItem = item;
+            }
+
+            // 检查最后一条是否高频
+            if (previousItem != null && (phr.Last().LastUpdate - previousItem.LastUpdate).TotalSeconds <= highFreqSampleInterval)
+            {
+                freqCollection.Add(previousItem);
+            }
+
+            return freqCollection;
+        }
+
+
         /// <summary>
         /// 获取孕妇心率众数
         /// </summary>