diff --git a/public/static/pdf/web/viewer.js b/public/static/pdf/web/viewer.js
index 4a4b2d41c..ff47ee580 100644
--- a/public/static/pdf/web/viewer.js
+++ b/public/static/pdf/web/viewer.js
@@ -6654,7 +6654,7 @@ var PDFPageView = function () {
           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: 0.3,//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