diff --git a/src/main/java/com/xydl/model/AssetItem.java b/src/main/java/com/xydl/model/AssetItem.java
index ce9ad6f..6b6afb9 100644
--- a/src/main/java/com/xydl/model/AssetItem.java
+++ b/src/main/java/com/xydl/model/AssetItem.java
@@ -22,18 +22,25 @@ public class AssetItem {
 
     public static AssetItem fromData(Map<String, Object> map, String timeField,
                                      I2relation relation, List<SyncFieldsInfo> fieldList) {
-        AssetItem root = new AssetItem();
-        root.setAssetCode(relation.getSensorid());
+
         List<AttributeItem> list = new ArrayList<>();
         for (SyncFieldsInfo field : fieldList) {
             if (relation.getSensorindex().equals(field.getSensorindex())) {
                 AttributeItem item = AttributeItem.fromData(map, field);
-                list.add(item);
+                if (item != null) {
+                    list.add(item);
+                }
             }
         }
-        root.setAttributeList(list);
-        LocalDateTime time = (LocalDateTime) map.get(timeField);
-        root.setTimestamp(time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());
-        return root;
+        if (list.size() > 0) {
+            AssetItem root = new AssetItem();
+            root.setAssetCode(relation.getSensorid());
+            root.setAttributeList(list);
+            LocalDateTime time = (LocalDateTime) map.get(timeField);
+            root.setTimestamp(time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());
+            return root;
+        } else {
+            return null;
+        }
     }
 }
diff --git a/src/main/java/com/xydl/model/AssetList.java b/src/main/java/com/xydl/model/AssetList.java
index 073f8e0..a101db6 100644
--- a/src/main/java/com/xydl/model/AssetList.java
+++ b/src/main/java/com/xydl/model/AssetList.java
@@ -16,18 +16,22 @@ public class AssetList {
 
     public static AssetList fromData(List<Map<String, Object>> dataList, String timeField,
                                      List<I2relation> relationList, List<SyncFieldsInfo> fieldList) {
-        AssetList root = new AssetList();
+
         List<AssetItem> list = new ArrayList<>();
-        if (relationList.size() > 1){
-            int a = 1;
-        }
         for (Map<String, Object> map : dataList) {
             for (I2relation relation : relationList) {
                 AssetItem item = AssetItem.fromData(map, timeField, relation, fieldList);
-                list.add(item);
+                if (item != null) {
+                    list.add(item);
+                }
             }
         }
-        root.setAssetList(list);
-        return root;
+        if (list.size() > 0) {
+            AssetList root = new AssetList();
+            root.setAssetList(list);
+            return root;
+        } else {
+            return null;
+        }
     }
 }
diff --git a/src/main/java/com/xydl/model/AttributeItem.java b/src/main/java/com/xydl/model/AttributeItem.java
index 5782fc6..0759b7c 100644
--- a/src/main/java/com/xydl/model/AttributeItem.java
+++ b/src/main/java/com/xydl/model/AttributeItem.java
@@ -14,9 +14,14 @@ public class AttributeItem {
     Object dataValue;
 
     public static AttributeItem fromData(Map<String, Object> map, SyncFieldsInfo field) {
-        AttributeItem root = new AttributeItem();
-        root.setAttributeCode(field.getDestFieldName());
-        root.setDataValue(map.get(field.getFieldName()));
-        return root;
+        Object value = map.get(field.getFieldName());
+        if (value != null) {
+            AttributeItem root = new AttributeItem();
+            root.setAttributeCode(field.getDestFieldName());
+            root.setDataValue(value);
+            return root;
+        } else {
+            return null;
+        }
     }
 }
diff --git a/src/main/java/com/xydl/service/MqttService.java b/src/main/java/com/xydl/service/MqttService.java
index bd6867f..f50df51 100644
--- a/src/main/java/com/xydl/service/MqttService.java
+++ b/src/main/java/com/xydl/service/MqttService.java
@@ -110,8 +110,10 @@ public class MqttService {
         } else {
             count = dataList.size();
             AssetList assetList = AssetList.fromData(dataList, table.getFieldName(), relationList, fieldList);
-            String json = JSONUtil.object2Json(assetList);
-            mqttUtil.publish2MQTT(json);
+            if (assetList != null) {
+                String json = JSONUtil.object2Json(assetList);
+                mqttUtil.publish2MQTT(json);
+            }
 
             Map<String, Object> lastMap = dataList.get(count - 1);
             LocalDateTime locdate = (LocalDateTime) lastMap.get(table.getFieldName());