diff --git a/springboot-web/src/main/java/com/tiesheng/web/pojos/dto/ImageCodeDTO.java b/springboot-web/src/main/java/com/tiesheng/web/pojos/dto/ImageCodeDTO.java
index eb6558e..6d719ba 100644
--- a/springboot-web/src/main/java/com/tiesheng/web/pojos/dto/ImageCodeDTO.java
+++ b/springboot-web/src/main/java/com/tiesheng/web/pojos/dto/ImageCodeDTO.java
@@ -26,6 +26,10 @@ public class ImageCodeDTO {
         if (height == null) {
             height = 62;
         }
+
+        width = Math.min(width, 500);
+        height = Math.min(height, 200);
+
         LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(width, height, 4, lineCount);
         lineCaptcha.setGenerator(new RandomGenerator("0123456789", 4));