diff --git a/src/main/java/me/zhyd/oauth/cache/AuthCacheScheduler.java b/src/main/java/me/zhyd/oauth/cache/AuthCacheScheduler.java
index fbdfa88783fc6384b686695500a47900d139b214..1cf7c01037c5601ee1e009c87dc76e4815755ffa 100644
--- a/src/main/java/me/zhyd/oauth/cache/AuthCacheScheduler.java
+++ b/src/main/java/me/zhyd/oauth/cache/AuthCacheScheduler.java
@@ -13,6 +13,9 @@ import java.util.concurrent.atomic.AtomicInteger;
  */
 public enum AuthCacheScheduler {
 
+    /**
+     * 当前实例
+     */
     INSTANCE;
 
     private AtomicInteger cacheTaskNumber = new AtomicInteger(1);
diff --git a/src/main/java/me/zhyd/oauth/cache/AuthDefaultStateCache.java b/src/main/java/me/zhyd/oauth/cache/AuthDefaultStateCache.java
new file mode 100644
index 0000000000000000000000000000000000000000..eb0fe8302a98aadc1c9b42e7e7a9523440e3ffb4
--- /dev/null
+++ b/src/main/java/me/zhyd/oauth/cache/AuthDefaultStateCache.java
@@ -0,0 +1,65 @@
+package me.zhyd.oauth.cache;
+
+/**
+ * @author yadong.zhang (yadong.zhang0415(a)gmail.com)
+ * @version 1.0
+ * @since 1.8
+ */
+public enum AuthDefaultStateCache implements AuthStateCache {
+
+    /**
+     * 当前实例
+     */
+    INSTANCE;
+
+    private AuthCache authCache;
+
+    AuthDefaultStateCache() {
+        authCache = new AuthDefaultCache();
+    }
+
+    /**
+     * 存入缓存
+     *
+     * @param key   缓存key
+     * @param value 缓存内容
+     */
+    @Override
+    public void cache(String key, String value) {
+        authCache.set(key, value);
+    }
+
+    /**
+     * 存入缓存
+     *
+     * @param key     缓存key
+     * @param value   缓存内容
+     * @param timeout 指定缓存过期时间（毫秒）
+     */
+    @Override
+    public void cache(String key, String value, long timeout) {
+        authCache.set(key, value, timeout);
+    }
+
+    /**
+     * 获取缓存内容
+     *
+     * @param key 缓存key
+     * @return 缓存内容
+     */
+    @Override
+    public String get(String key) {
+        return authCache.get(key);
+    }
+
+    /**
+     * 是否存在key，如果对应key的value值已过期，也返回false
+     *
+     * @param key 缓存key
+     * @return true：存在key，并且value没过期；false：key不存在或者已过期
+     */
+    @Override
+    public boolean containsKey(String key) {
+        return authCache.containsKey(key);
+    }
+}
diff --git a/src/main/java/me/zhyd/oauth/cache/AuthStateCache.java b/src/main/java/me/zhyd/oauth/cache/AuthStateCache.java
index e667829dbd8ed7cf63cfc7e3f7b81870fe2b9ccf..77a11e292859d4e8b90f65de8bdccaea816e32c6 100644
--- a/src/main/java/me/zhyd/oauth/cache/AuthStateCache.java
+++ b/src/main/java/me/zhyd/oauth/cache/AuthStateCache.java
@@ -1,22 +1,21 @@
 package me.zhyd.oauth.cache;
 
 /**
- * @author yadong.zhang (yadong.zhang0415(a)gmail.com)
- * @version 1.0
- * @since 1.8
+ * <p>
+ * State缓存接口，方便用户扩展
+ * </p>
+ *
+ * @author yangkai.shen
+ * @date Created in 2019-08-02 10:55
  */
-public class AuthStateCache {
-    private static AuthCache authCache = new AuthDefaultCache();
-
+public interface AuthStateCache {
     /**
      * 存入缓存
      *
      * @param key   缓存key
      * @param value 缓存内容
      */
-    public static void cache(String key, String value) {
-        authCache.set(key, value);
-    }
+    void cache(String key, String value);
 
     /**
      * 存入缓存
@@ -25,9 +24,7 @@ public class AuthStateCache {
      * @param value   缓存内容
      * @param timeout 指定缓存过期时间（毫秒）
      */
-    public static void cache(String key, String value, long timeout) {
-        authCache.set(key, value, timeout);
-    }
+    void cache(String key, String value, long timeout);
 
     /**
      * 获取缓存内容
@@ -35,9 +32,7 @@ public class AuthStateCache {
      * @param key 缓存key
      * @return 缓存内容
      */
-    public static String get(String key) {
-        return authCache.get(key);
-    }
+    String get(String key);
 
     /**
      * 是否存在key，如果对应key的value值已过期，也返回false
@@ -45,7 +40,5 @@ public class AuthStateCache {
      * @param key 缓存key
      * @return true：存在key，并且value没过期；false：key不存在或者已过期
      */
-    public static boolean containsKey(String key) {
-        return authCache.containsKey(key);
-    }
+    boolean containsKey(String key);
 }
diff --git a/src/main/java/me/zhyd/oauth/request/AuthDefaultRequest.java b/src/main/java/me/zhyd/oauth/request/AuthDefaultRequest.java
index 401c8b470e945e64fa5577a7832cbeecc172d218..da7028c4e817ab7b03f8a9a12a83189fa6b06bb0 100644
--- a/src/main/java/me/zhyd/oauth/request/AuthDefaultRequest.java
+++ b/src/main/java/me/zhyd/oauth/request/AuthDefaultRequest.java
@@ -3,6 +3,7 @@ package me.zhyd.oauth.request;
 import cn.hutool.http.HttpRequest;
 import cn.hutool.http.HttpResponse;
 import lombok.extern.slf4j.Slf4j;
+import me.zhyd.oauth.cache.AuthDefaultStateCache;
 import me.zhyd.oauth.cache.AuthStateCache;
 import me.zhyd.oauth.config.AuthConfig;
 import me.zhyd.oauth.config.AuthSource;
@@ -28,10 +29,16 @@ import me.zhyd.oauth.utils.UuidUtils;
 public abstract class AuthDefaultRequest implements AuthRequest {
     protected AuthConfig config;
     protected AuthSource source;
+    protected AuthStateCache authStateCache;
 
     public AuthDefaultRequest(AuthConfig config, AuthSource source) {
+        this(config, source, AuthDefaultStateCache.INSTANCE);
+    }
+
+    public AuthDefaultRequest(AuthConfig config, AuthSource source, AuthStateCache authStateCache) {
         this.config = config;
         this.source = source;
+        this.authStateCache = authStateCache;
         if (!AuthChecker.isSupportedAuth(config, source)) {
             throw new AuthException(AuthResponseStatus.PARAMETER_INCOMPLETE);
         }
@@ -189,7 +196,7 @@ public abstract class AuthDefaultRequest implements AuthRequest {
             state = UuidUtils.getUUID();
         }
         // 缓存state
-        AuthStateCache.cache(state, state);
+        authStateCache.cache(state, state);
         return state;
     }