diff --git a/src/main/java/com/chinaweal/aiccs/org/controller/OAuth2Controller.java b/src/main/java/com/chinaweal/aiccs/org/controller/OAuth2Controller.java
index 0cc8a5d..21f3a22 100644
--- a/src/main/java/com/chinaweal/aiccs/org/controller/OAuth2Controller.java
+++ b/src/main/java/com/chinaweal/aiccs/org/controller/OAuth2Controller.java
@@ -33,8 +33,11 @@ import org.springframework.web.bind.annotation.*;
 import javax.servlet.http.HttpServletRequest;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 /**
@@ -646,7 +649,14 @@ public class OAuth2Controller extends BaseController {
                         .location(java.net.URI.create("/integration/#/login?requestId=" + requestId + "&error=" + URLEncoder.encode("统一身份认证回调信息不足以支持登录，请联系系统管理员", "UTF-8")))
                         .build();
             }
-            List<UserSupInfo> supList = userSupInfoService.lambdaQuery().eq(UserSupInfo::getIdcardAbstr, DigestUtils.md5DigestAsHex(userInfo.getIdCard().getBytes())).list();
+
+            // 处理身份证末尾x的大小写兼容
+            Set<String> idCardList = new HashSet<>(2);
+            String idCard = userInfo.getIdCard();
+            idCardList.add(DigestUtils.md5DigestAsHex(idCard.toUpperCase().getBytes(StandardCharsets.UTF_8)));
+            idCardList.add(DigestUtils.md5DigestAsHex(idCard.toLowerCase().getBytes(StandardCharsets.UTF_8)));
+
+            List<UserSupInfo> supList = userSupInfoService.lambdaQuery().in(UserSupInfo::getIdcardAbstr, idCardList).list();
             if (CollectionUtils.isEmpty(supList)) {
                 return ResponseEntity.status(HttpStatus.FOUND)
                         .location(java.net.URI.create("/integration/#/login?requestId=" + requestId + "&error=" + URLEncoder.encode("无匹配的综合监管用户，请联系系统管理员", "UTF-8")))