diff --git a/client/client.go b/client/client.go
index ee51364..02420b0 100644
--- a/client/client.go
+++ b/client/client.go
@@ -161,11 +161,11 @@ func startDownloadTask(filePath string, tempFilePath string, b *block, client tr
 		log.Fatalf("下载异常 : %v\n", err)
 	}
 
-	err = createFileOnly(tempFilePath)
+	fp, err := os.OpenFile(tempFilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0755)
 	if err != nil {
-		log.Println(err.Error())
-		panic(err)
+		log.Fatalf("文件打开异常: %s\n", err)
 	}
+	defer fp.Close()
 
 	var recvSize int64 = 0
 
@@ -180,7 +180,7 @@ func startDownloadTask(filePath string, tempFilePath string, b *block, client tr
 		recvSize += int64(blockSize)
 
 		if blockSize != 0 {
-			err := appendToFile(tempFilePath, block)
+			_, err = fp.Write(block)
 			if err != nil {
 				log.Fatalf("临时文件保存异常: %s\n", err)
 			}
@@ -419,7 +419,7 @@ func appendToFile(fileName string, content []byte) error {
 		// 查找文件末尾的偏移量
 		n, _ := f.Seek(0, os.SEEK_END)
 		// 从末尾的偏移量开始写入内容
-		_, err = f.WriteAt(content, n)
+		_, err = f.WriteAt([]byte(content), n)
 	}
 	defer f.Close()
 	return err