diff --git a/ems-system/src/main/java/com/xzzn/ems/mapper/EmsAmmeterDataMapper.java b/ems-system/src/main/java/com/xzzn/ems/mapper/EmsAmmeterDataMapper.java
index b63d33a..62a1bdf 100644
--- a/ems-system/src/main/java/com/xzzn/ems/mapper/EmsAmmeterDataMapper.java
+++ b/ems-system/src/main/java/com/xzzn/ems/mapper/EmsAmmeterDataMapper.java
@@ -89,4 +89,8 @@ public interface EmsAmmeterDataMapper
     public List<PowerStatisListVo> getPowerDataByDay(DateSearchRequest requestVo);
     public List<PowerStatisListVo> getPowerDataByMonth(DateSearchRequest requestVo);
     public List<PowerStatisListVo> getPowerDataByMinutes(DateSearchRequest requestVo);
+
+    // 获取最新数据
+    public EmsAmmeterData getLastData(@Param("siteId")String siteId, @Param("deviceId")String deviceId);
+
 }
diff --git a/ems-system/src/main/java/com/xzzn/ems/service/impl/FXXDataProcessServiceImpl.java b/ems-system/src/main/java/com/xzzn/ems/service/impl/FXXDataProcessServiceImpl.java
index 2b844a4..49af4ff 100644
--- a/ems-system/src/main/java/com/xzzn/ems/service/impl/FXXDataProcessServiceImpl.java
+++ b/ems-system/src/main/java/com/xzzn/ems/service/impl/FXXDataProcessServiceImpl.java
@@ -18,7 +18,6 @@ import com.xzzn.ems.mapper.*;
 import com.xzzn.ems.service.IEmsAlarmRecordsService;
 import com.xzzn.ems.service.IFXXDataProcessService;
 import com.xzzn.ems.utils.AbstractBatteryDataProcessor;
-import org.apache.commons.lang3.ObjectUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.BeanUtils;
@@ -682,6 +681,9 @@ public class FXXDataProcessServiceImpl extends AbstractBatteryDataProcessor impl
         Map<String, Object> obj = JSON.parseObject(dataJson, new TypeReference<Map<String, Object>>() {
         });
 
+        // 获取上次数据，便于后面计算差值均无则默认0
+        EmsAmmeterData lastAmmeterData = getLastAmmeterData(deviceId);
+
         EmsAmmeterData dataLoad = new EmsAmmeterData();
         // 更新时间
         dataLoad.setDataUpdateTime(dataUpdateTime);
@@ -770,10 +772,26 @@ public class FXXDataProcessServiceImpl extends AbstractBatteryDataProcessor impl
         redisCache.setCacheObject(RedisKeyConstants.AMMETER + SITE_ID + "_" +deviceId, dataLoad);
 
         // 处理电表每日充放电数据
-        dealAmmeterDailyDate(obj, deviceId, dataUpdateTime);
+        dealAmmeterDailyDate(obj, deviceId, dataUpdateTime, lastAmmeterData);
     }
 
-    private void dealAmmeterDailyDate(Map<String, Object> obj, String deviceId, Date dataUpdateTime) {
+    private EmsAmmeterData getLastAmmeterData(String deviceId) {
+        // 先从redis取，取不到查数据
+        EmsAmmeterData lastData = redisCache.getCacheObject(RedisKeyConstants.AMMETER + SITE_ID + "_" +deviceId);
+        if (lastData == null) {
+            lastData = emsAmmeterDataMapper.getLastData(SITE_ID,deviceId);
+            if (lastData == null) {
+                lastData = new EmsAmmeterData();
+                lastData.setSiteId(SITE_ID);
+                lastData.setDeviceId(deviceId);
+                lastData.setCurrentForwardActiveTotal(BigDecimal.ZERO);
+                lastData.setCurrentReverseActiveTotal(BigDecimal.ZERO);
+            }
+        }
+        return  lastData;
+    }
+
+    private void dealAmmeterDailyDate(Map<String, Object> obj, String deviceId, Date dataUpdateTime, EmsAmmeterData lastData) {
         // 先获取当月电价配置，redis没有这查数据库，都没有则返回
         String priceKey = RedisKeyConstants.ENERGY_PRICE_TIME + SITE_ID + "_" + LocalDate.now().getYear() + LocalDate.now().getMonthValue();
         List<EnergyPriceTimeRange> timeRanges = redisCache.getCacheObject(priceKey);
@@ -799,41 +817,28 @@ public class FXXDataProcessServiceImpl extends AbstractBatteryDataProcessor impl
             return;
         }
 
-        // 确定数据类型，获取小于等于开始时刻的最新数据。
-        startTime = concateCurrentDayTime(startTime);
-        String startTimeDataKey = RedisKeyConstants.DIFF_CHARGE_START + SITE_ID +"_" + startTime;
-        Map<String, BigDecimal> redisHash = redisCache.getCacheObject(startTimeDataKey);
-        // redis无，就取数据库
-        if (redisHash == null) {
-            // 查询数据库-电表表数据取截止到昨日最新一条数据，均无默认初始值0
-            EmsAmmeterData ammeterData = emsAmmeterDataMapper.getYestLatestDate(SITE_ID,deviceId,startTime);
-            redisHash = new HashMap<>();
-            redisHash.put("charge", ammeterData == null ?
-                    new BigDecimal(0) : ammeterData.getCurrentForwardActiveTotal());
-            redisHash.put("discharge", ammeterData == null ?
-                    new BigDecimal(0) : ammeterData.getCurrentReverseActiveTotal());
-            redisCache.setCacheObject(startTimeDataKey, redisHash, 24, TimeUnit.HOURS);
-        }
-
         //初始化电表每日差值对象
         EmsDailyEnergyData energyData = initEnergyData();
 
-        // 根据 costType 计算差值
-        setDiffByCostType(costType,energyData,redisHash,obj);
+        // 根据 costType，计算本次与上次数据差值，累加到对应的数据类型里面
+        setDiffByCostType(costType,energyData,lastData,obj);
 
         // 插入或更新电表每日差值数据表
         emsDailyEnergyDataMapper.insertOrUpdateData(energyData);
     }
 
-    private void setDiffByCostType(String costType, EmsDailyEnergyData energyData, Map<String, BigDecimal> redisHash, Map<String, Object> obj) {
+    private void setDiffByCostType(String costType, EmsDailyEnergyData energyData, EmsAmmeterData lastData, Map<String, Object> obj) {
         BigDecimal currentChargeData = StringUtils.getBigDecimal(obj.get("ZXYGDN"));
         BigDecimal currentDischargeData = StringUtils.getBigDecimal(obj.get("FXYGDN"));
         currentChargeData = currentChargeData != null ? currentChargeData : BigDecimal.ZERO;
         currentDischargeData = currentDischargeData != null ? currentDischargeData : BigDecimal.ZERO;
 
-        // 计算差值，根据类型累加
-        BigDecimal chargeDiffData = currentChargeData.subtract(redisHash.getOrDefault("charge", BigDecimal.ZERO));
-        BigDecimal disChargeDiffData = currentDischargeData.subtract(redisHash.getOrDefault("discharge", BigDecimal.ZERO));
+        // 计算时段差值，按照数据类型累加
+        BigDecimal chargeDiffData = currentChargeData.subtract(
+                lastData.getCurrentForwardActiveTotal() == null ? BigDecimal.ZERO : lastData.getCurrentForwardActiveTotal());
+        BigDecimal disChargeDiffData = currentDischargeData.subtract(
+                lastData.getCurrentReverseActiveTotal() == null ? BigDecimal.ZERO : lastData.getCurrentReverseActiveTotal()
+        );
         switch (costType) {
             case "peak":
                 BigDecimal peakCharge = energyData.getPeakChargeDiff();
diff --git a/ems-system/src/main/resources/mapper/ems/EmsAmmeterDataMapper.xml b/ems-system/src/main/resources/mapper/ems/EmsAmmeterDataMapper.xml
index 53fc6d4..f49a05a 100644
--- a/ems-system/src/main/resources/mapper/ems/EmsAmmeterDataMapper.xml
+++ b/ems-system/src/main/resources/mapper/ems/EmsAmmeterDataMapper.xml
@@ -1048,4 +1048,17 @@
         GROUP BY statisDate
         order by statisDate desc
     </select>
+
+    <select id="getLastData" resultMap="EmsAmmeterDataResult">
+        SELECT
+            t.site_id,
+            t.device_id,
+            t.data_update_time,
+            t.current_forward_active_total,
+            t.current_reverse_active_total
+        FROM ems_ammeter_data t
+        WHERE  site_id = #{siteId}
+          and device_id = #{deviceId}
+        ORDER BY data_update_time DESC  LIMIT 1
+    </select>
 </mapper>
\ No newline at end of file