diff --git a/dsSupport/ConvertMovie/Convert.go b/dsSupport/Business/ConvertMovie/Convert.go
similarity index 100%
rename from dsSupport/ConvertMovie/Convert.go
rename to dsSupport/Business/ConvertMovie/Convert.go
diff --git a/dsSupport/Business/Preview/PreviewController/PreviewController.go b/dsSupport/Business/Preview/PreviewController/PreviewController.go
index 82a0eb30..2781a55b 100644
--- a/dsSupport/Business/Preview/PreviewController/PreviewController.go
+++ b/dsSupport/Business/Preview/PreviewController/PreviewController.go
@@ -11,7 +11,6 @@ import (
 	"net/http"
 	"os"
 	"path"
-	"path/filepath"
 	"strings"
 )
 
@@ -41,16 +40,28 @@ func previewOffice(c *gin.Context) {
 		return
 	}
 	fullPath := string(uDec)
+	//判断是不是华为云上存在，原则上存在就不需要再次上传了~
+	tempArray:=strings.Split(strings.Replace(strings.ToLower(fullPath),"\\","/",-1),"/")
+	fiName:=tempArray[len(tempArray)-1]
+	key := Const.PreviewPrefix + fiName
+	url := "http://ow365.cn/?i=14531&fname=" + fiName + "&furl=http%3A%2F%2Fvideo.edusoa.com%2F" + key
+	//如果存在，则直接返回
+	if ObsUtil.IsExist(fiName){
+		//输出预览地址
+		c.String(http.StatusOK, url)
+		//fmt.Println("文件已在云存储中存在，无需下载和上传！")
+		return
+	}
 	//(1) 是否以http或https开头
 	if strings.HasPrefix(strings.ToLower(fullPath), "https://") || strings.HasPrefix(strings.ToLower(fullPath), "http://") {
 		//文件名称
 		arr := strings.Split(fullPath, "/")
 		fi := arr[len(arr)-1]
 		if !CommonUtil.IsContainString(allowExtension,"."+path.Ext(fi)){
-			c.String(http.StatusOK, "输入的预览文件，系统不支持!")
+			c.String(http.StatusOK, "输入的预览文件格式，系统不支持!")
 			return
 		}
-		//下载
+		//准备下载
 		res, err := http.Get(fullPath)
 		if err != nil {
 			c.String(http.StatusOK, "输入的网络地址无法找到，不能进行预览!")
@@ -68,8 +79,6 @@ func previewOffice(c *gin.Context) {
 		io.Copy(f, res.Body)
 	}
 	//(2) 是不是本地文件
-	_, p := filepath.Split(fullPath)
-
 	//判断是不是本地存在
 	isExist, err := CommonUtil.PathExists(fullPath)
 	if err != nil {
@@ -81,10 +90,7 @@ func previewOffice(c *gin.Context) {
 		return
 	}
 	//将文件上传到华为云
-	key := Const.PreviewPrefix + p
 	ObsUtil.UploadFileMultiPart(key, fullPath)
-	//返回地址
-	url := "http://ow365.cn/?i=14531&fname=" + p + "&furl=http%3A%2F%2Fvideo.edusoa.com%2F" + key
 	//输出预览地址
 	c.String(http.StatusOK, url)
 }
diff --git a/dsSupport/Test/PreviewTest/PreviewTest.go b/dsSupport/Test/PreviewTest/PreviewTest.go
index 1aebdb1a..280cb532 100644
--- a/dsSupport/Test/PreviewTest/PreviewTest.go
+++ b/dsSupport/Test/PreviewTest/PreviewTest.go
@@ -14,7 +14,6 @@ import (
  */
 func showPreview(input string){
 	uEnc := base64.URLEncoding.EncodeToString([]byte(input))
-	fmt.Println(uEnc)
 	//生成预览OFFICE的服务地址
 	url := "http://10.10.24.100:9000/support/preview/previewOffice"
 	resp, _ := http.Get(url+"?p="+uEnc)
@@ -28,12 +27,13 @@ func main() {
 	// 如果要用在url中，需要使用URLEncoding
 	//input:="C:\\Users\\Administrator\\Desktop\\技术讨论会\\20A4782A-512C-40ED-8AF9-FCFC7CD29E5B.docx"
 	//showPreview(input)
+
 	//（2）传入http参数
 	//input="https://dsideal.obs.cn-north-1.myhuaweicloud.com/Material/02/0200C9BE-07C6-4EFC-A945-8554C7D41790.doc"
 	//showPreview(input)
 
-	input:=`E:\Work\ShlProjectJava\src\main\java\com\shl\zuowen\model\zuowenModel.java`
-	showPreview(input)
+	//input:=`E:\Work\ShlProjectJava\src\main\java\com\shl\zuowen\model\zuowenModel.java`
+	//showPreview(input)
 	//Java的调用方法示例：
 	//https://blog.csdn.net/orangleliu/article/details/38309367
 }
diff --git a/dsSupport/Utils/ObsUtil/ObsUtil.go b/dsSupport/Utils/ObsUtil/ObsUtil.go
index 6ea50a04..87c05f0b 100644
--- a/dsSupport/Utils/ObsUtil/ObsUtil.go
+++ b/dsSupport/Utils/ObsUtil/ObsUtil.go
@@ -1,19 +1,34 @@
 package ObsUtil
 
 import (
+	"dsSupport/Const"
 	"dsSupport/Utils/ConfigUtil"
 	"dsSupport/Utils/obs"
 	"fmt"
+	"net/http"
 	"os"
 	"time"
 )
 
+/**
+功能：判断一个文件在OBS上是不是存在
+作者：黄海
+时间：2020-07-16
+*/
+func IsExist(key string) bool {
+	_, err := http.Head("https://"+ConfigUtil.Endpoint+"/"+ConfigUtil.Bucket+"/"+Const.PreviewPrefix + key)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
 /**
 功能：删除指定前缀的过期文件
 作者：黄海
 时间：2020-04-05
 */
-func DeleteExpireFile(prefix string,remainDays int32){
+func DeleteExpireFile(prefix string, remainDays int32) {
 	// 创建ObsClient结构体
 	var obsClient, _ = obs.New(ConfigUtil.Ak, ConfigUtil.Sk, ConfigUtil.Endpoint)
 
@@ -32,14 +47,14 @@ func DeleteExpireFile(prefix string,remainDays int32){
 			now := time.Now()
 			sumD := now.Sub(val.LastModified)
 			if int32(sumD.Hours()/24) > remainDays {
-				fmt.Println("发现超时文件，将删除:"+val.Key)
+				fmt.Println("发现超时文件，将删除:" + val.Key)
 				input := &obs.DeleteObjectInput{}
 				input.Bucket = ConfigUtil.Bucket
 				input.Key = val.Key
 				obsClient.DeleteObject(input)
 				fmt.Println("已成功删除！" + val.Key)
-			}else{
-				fmt.Println("没有过期，无需删除:"+val.Key)
+			} else {
+				fmt.Println("没有过期，无需删除:" + val.Key)
 			}
 		}
 	} else if obsError, ok := err.(obs.ObsError); ok {
@@ -54,7 +69,7 @@ func DeleteExpireFile(prefix string,remainDays int32){
 作者：黄海
 时间：2020-04-05
 */
-func UploadFileMultiPart(key string,sourceFile string){
+func UploadFileMultiPart(key string, sourceFile string) {
 	// 创建ObsClient结构体
 	var obsClient, _ = obs.New(ConfigUtil.Ak, ConfigUtil.Sk, ConfigUtil.Endpoint)
 	// 初始化分段上传任务
diff --git a/dsSupport/main.go b/dsSupport/main.go
index db1b7f97..cae0aada 100644
--- a/dsSupport/main.go
+++ b/dsSupport/main.go
@@ -10,7 +10,7 @@ import (
 )
 
 func main(){
-	// 一、显示Logo
+	// 显示Logo
 	configIniFile := "./Config/logo.txt"
 	var logo = FileUtil.ReadFileContent(configIniFile)
 	fmt.Print(logo)