diff --git a/rop/src/main/java/com/rop/security/DefaultSecurityManager.java b/rop/src/main/java/com/rop/security/DefaultSecurityManager.java
index 3bc1e28..8dedd26 100644
--- a/rop/src/main/java/com/rop/security/DefaultSecurityManager.java
+++ b/rop/src/main/java/com/rop/security/DefaultSecurityManager.java
@@ -315,7 +315,7 @@ private MainError checkSign(RopRequestContext ctx) {
                     }
 
                     String signValue = RopUtils.sign(needSignParams, signSecret);
-                    if (!signValue.equals(ctx.getSign())) {
+                    if (!signValue.equalsIgnoreCase(ctx.getSign())) {
                         if (logger.isErrorEnabled()) {
                             logger.error(ctx.getAppKey() + "的签名不合法，请检查");
                         }