diff --git a/txw-sso/txw-sso-service-biz/src/main/java/com/css/txw/sso/service/verify/VerifyServiceImpl.java b/txw-sso/txw-sso-service-biz/src/main/java/com/css/txw/sso/service/verify/VerifyServiceImpl.java
index 04e0c20..7ceb123 100644
--- a/txw-sso/txw-sso-service-biz/src/main/java/com/css/txw/sso/service/verify/VerifyServiceImpl.java
+++ b/txw-sso/txw-sso-service-biz/src/main/java/com/css/txw/sso/service/verify/VerifyServiceImpl.java
@@ -1,12 +1,22 @@
 package com.css.txw.sso.service.verify;
 
+import cn.hutool.captcha.CaptchaUtil;
+import cn.hutool.captcha.ICaptcha;
+import cn.hutool.captcha.generator.RandomGenerator;
 import cn.hutool.core.util.IdUtil;
 import com.css.ggzc.framework.common.pojo.CommonResult;
 import com.css.txw.sso.properties.SsoProperties;
+import org.springframework.context.annotation.Bean;
 import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.Resource;
+import javax.imageio.ImageIO;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
 
@@ -17,6 +27,16 @@ public class VerifyServiceImpl implements VerifyService {
     private StringRedisTemplate stringRedisTemplate;
     @Resource
     private SsoProperties ssoProperties;
+    @Resource
+    private ICaptcha lineCaptcha;
+
+    @Bean
+    public ICaptcha lineCaptcha() {
+        RandomGenerator randomGenerator = new RandomGenerator("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 4);
+        cn.hutool.captcha.CircleCaptcha captcha = CaptchaUtil.createCircleCaptcha(120, 40, 4, 20);
+        captcha.setGenerator(randomGenerator);
+        return captcha;
+    }
 
     @Override
     public CommonResult<String> getVerifyToken(String remoteId) {
@@ -38,4 +58,51 @@ public class VerifyServiceImpl implements VerifyService {
         String VERIFY_TOKEN = "verify_token:%s";
         return String.format(VERIFY_TOKEN, verifyToken);
     }
+
+    @Override
+    public CommonResult<Map<String, String>> getCaptcha(String remoteId) {
+        String code = lineCaptcha.getCode();
+        String uuid = IdUtil.fastSimpleUUID();
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try {
+            ImageIO.write(lineCaptcha.getImage(), "png", baos);
+        } catch (IOException e) {
+            throw new RuntimeException("生成验证码图片失败", e);
+        }
+        String imageBase64 = "data:image/png;base64," + Base64.getEncoder().encodeToString(baos.toByteArray());
+
+        stringRedisTemplate.opsForValue().set(
+            formatCaptchaKey(uuid),
+            code.toLowerCase(),
+            5,
+            TimeUnit.MINUTES
+        );
+
+        Map<String, String> result = new HashMap<>();
+        result.put("uuid", uuid);
+        result.put("imageBase64", imageBase64);
+        return CommonResult.success(result);
+    }
+
+    @Override
+    public Boolean checkCaptcha(String uuid, String code) {
+        if (!this.ssoProperties.isLoginCaptcha()) {
+            return true;
+        }
+        if (org.springframework.util.StringUtils.isBlank(uuid) || org.springframework.util.StringUtils.isBlank(code)) {
+            return false;
+        }
+        String key = formatCaptchaKey(uuid);
+        String cachedCode = stringRedisTemplate.opsForValue().get(key);
+        if (cachedCode == null) {
+            return false;
+        }
+        stringRedisTemplate.delete(key);
+        return cachedCode.equalsIgnoreCase(code);
+    }
+
+    private static String formatCaptchaKey(String uuid) {
+        return "captcha:" + uuid;
+    }
 }