diff --git a/public/static/pdf/web/viewer.js b/public/static/pdf/web/viewer.js
index b9da437b7..b81ad686c 100644
--- a/public/static/pdf/web/viewer.js
+++ b/public/static/pdf/web/viewer.js
@@ -10639,7 +10639,7 @@ class PDFPageView {
       watermark_x_space: 40,//水印x轴间隔
       watermark_y_space: 50,//水印y轴间隔
       watermark_color: 'rgba(232,232,240)',//水印字体颜色
-      watermark_alpha: 0.6,//水印透明度
+      watermark_alpha: 0.4,//水印透明度
       watermark_fontsize: '40px',//水印字体大小
       watermark_font: '微软雅黑',//水印字体
       watermark_width: 120,//水印宽度