diff --git a/src/utils/kkFilePreview.js b/src/utils/kkFilePreview.js
index c1a2f9b5..6b5cdf76 100644
--- a/src/utils/kkFilePreview.js
+++ b/src/utils/kkFilePreview.js
@@ -13,7 +13,7 @@ export const kkFilePreview = (fileUrl) => {
   // 水印内容
   const watermarkTxt = `${userInfo.username} ${userInfo.realname}`
   // 客户环境预览需要加的加密参数
-  const watermarkSign = md5(watermarkTxt, 'cnhtc')
+  const watermarkSign = md5(watermarkTxt + 'cnhtc')
   const url = `${window._CONFIG.onlinePreviewDomainURL}?url=${encodeURIComponent(Base64.encode(fileUrl))}&watermarkTxt=${encodeURIComponent(watermarkTxt)}&watermarkSign=${watermarkSign}`
   window.open(url)
 }
\ No newline at end of file