diff --git a/mall-ebtp-cloud-attachment-sdk/src/main/java/com/chinaunicom/ebtp/mall/cloud/attachment/sdk/convertor/ModelConvertor.java b/mall-ebtp-cloud-attachment-sdk/src/main/java/com/chinaunicom/ebtp/mall/cloud/attachment/sdk/convertor/ModelConvertor.java
index b7c2c2e..2ff9c1c 100644
--- a/mall-ebtp-cloud-attachment-sdk/src/main/java/com/chinaunicom/ebtp/mall/cloud/attachment/sdk/convertor/ModelConvertor.java
+++ b/mall-ebtp-cloud-attachment-sdk/src/main/java/com/chinaunicom/ebtp/mall/cloud/attachment/sdk/convertor/ModelConvertor.java
@@ -1,7 +1,6 @@
 package com.chinaunicom.ebtp.mall.cloud.attachment.sdk.convertor;
 
 import java.nio.charset.Charset;
-import java.util.List;
 import java.util.Optional;
 
 import com.chinaunicom.ebtp.mall.cloud.attachment.sdk.model.AttachmentEntity;
@@ -11,7 +10,6 @@ import com.chinaunicom.ebtp.mall.cloud.attachment.sdk.vo.SysStorageVO;
 import com.chinaunicom.ebtp.mall.cloud.attachment.sdk.vo.down.DownStream;
 import com.chinaunicom.ebtp.mall.cloud.attachment.sdk.vo.query.QueryResult;
 import com.chinaunicom.ebtp.mall.cloud.attachment.sdk.vo.upload.UploadStream;
-import com.chinaunicom.ebtp.mall.cloud.attachment.sdk.vo.upload.UploadStreamData;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.JsonMappingException;
@@ -136,7 +134,8 @@ public class ModelConvertor {
 	 */
 	private SysStorageVO tpDownPO(String json) throws JsonMappingException, JsonProcessingException {
 		log.debug("current convertor json is: {}", json);
-		return objectMapper.readValue(json, DownStream.class).getData().getSysStorageVO();
+		return Optional.ofNullable(objectMapper.readValue(json, DownStream.class))
+				.map(ds -> ds.getData().getSysStorageVO()).orElseGet(SysStorageVO::new);
 	}
 
 	/**
@@ -147,9 +146,9 @@ public class ModelConvertor {
 	 */
 	private SysStorageVO toUploadPO(String json) throws JsonMappingException, JsonProcessingException {
 		log.debug("current convertor json is: {}", json);
-		List<UploadStreamData> list = objectMapper.readValue(json, UploadStream.class).getData();
-
-		return list.stream().findFirst().map(obj -> obj.getSysStorageVO()).orElseGet(SysStorageVO::new);
+		return Optional.ofNullable(objectMapper.readValue(json, UploadStream.class).getData())
+				.map(ls -> ls.stream().findFirst().map(obj -> obj.getSysStorageVO()).orElseGet(() -> null))
+				.orElseGet(SysStorageVO::new);
 	}
 
 }