diff --git a/mhd-gateway/src/main/java/com/mhd/gateway/config/CaptchaConfig.java b/mhd-gateway/src/main/java/com/mhd/gateway/config/CaptchaConfig.java
index 08fffa6e7..a490cad65 100644
--- a/mhd-gateway/src/main/java/com/mhd/gateway/config/CaptchaConfig.java
+++ b/mhd-gateway/src/main/java/com/mhd/gateway/config/CaptchaConfig.java
@@ -34,6 +34,8 @@ public class CaptchaConfig
         properties.setProperty(KAPTCHA_SESSION_CONFIG_KEY, "kaptchaCode");
         // 验证码文本字符长度 默认为5
         properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "4");
+        // 验证码文本字符源 默认为abcde2345678gfynmnpqr 改为纯数字
+        properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_STRING, "0123456789");
         // 验证码文本字体样式 默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)
         properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_NAMES, "Arial,Courier");
         // 图片样式 水纹com.google.code.kaptcha.impl.WaterRipple 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy 阴影com.google.code.kaptcha.impl.ShadowGimpy