diff --git a/core/src/main/java/com/wechat/pay/java/core/certificate/RSAAutoCertificateProvider.java b/core/src/main/java/com/wechat/pay/java/core/certificate/RSAAutoCertificateProvider.java
index 6e1072f2..d24c6c5f 100644
--- a/core/src/main/java/com/wechat/pay/java/core/certificate/RSAAutoCertificateProvider.java
+++ b/core/src/main/java/com/wechat/pay/java/core/certificate/RSAAutoCertificateProvider.java
@@ -79,7 +79,8 @@ public Builder merchantSerialNumber(String merchantSerialNumber) {
     }
 
     public Builder httpClientBuilder(AbstractHttpClientBuilder<?> builder) {
-      this.httpClientBuilder = builder;
+      // httpClientBuilder 不是不可变的，所以为了避免过程中修改入参或者值发生变化，这里制作了一个副本
+      this.httpClientBuilder = builder.newInstance();
       return this;
     }
 
diff --git a/core/src/main/java/com/wechat/pay/java/core/http/AbstractHttpClientBuilder.java b/core/src/main/java/com/wechat/pay/java/core/http/AbstractHttpClientBuilder.java
index 3b00fb5d..1f1b6164 100644
--- a/core/src/main/java/com/wechat/pay/java/core/http/AbstractHttpClientBuilder.java
+++ b/core/src/main/java/com/wechat/pay/java/core/http/AbstractHttpClientBuilder.java
@@ -5,11 +5,18 @@
 
 public interface AbstractHttpClientBuilder<T extends AbstractHttpClientBuilder<T>> {
 
+  /**
+   * 复制工厂，复制一个当前对象
+   *
+   * @return 对象的副本
+   */
+  T newInstance();
+
   /**
    * 设置验证器
    *
    * @param validator 验证器
-   * @return T the AbstractHttpClientBuilder
+   * @return the AbstractHttpClientBuilder
    */
   T validator(Validator validator);
 
@@ -17,12 +24,12 @@ public interface AbstractHttpClientBuilder<T extends AbstractHttpClientBuilder<T
    * 设置凭据生成器
    *
    * @param credential 凭据生成器
-   * @return T the AbstractHttpClientBuilder
+   * @return the AbstractHttpClientBuilder
    */
   T credential(Credential credential);
 
   /**
-   * * 构建 AbstractHttpClient
+   * 构建 AbstractHttpClient
    *
    * @return AbstractHttpClient
    */
diff --git a/core/src/main/java/com/wechat/pay/java/core/http/DefaultHttpClientBuilder.java b/core/src/main/java/com/wechat/pay/java/core/http/DefaultHttpClientBuilder.java
index 0b62790b..20588538 100644
--- a/core/src/main/java/com/wechat/pay/java/core/http/DefaultHttpClientBuilder.java
+++ b/core/src/main/java/com/wechat/pay/java/core/http/DefaultHttpClientBuilder.java
@@ -22,6 +22,24 @@ public class DefaultHttpClientBuilder
   private int connectTimeoutMs = -1;
   private Proxy proxy;
 
+  /**
+   * 复制工厂，复制一个当前对象
+   *
+   * @return 对象的副本
+   */
+  @Override
+  public DefaultHttpClientBuilder newInstance() {
+    DefaultHttpClientBuilder result = new DefaultHttpClientBuilder();
+    result.credential = this.credential;
+    result.validator = this.validator;
+    result.customizeOkHttpClient = this.customizeOkHttpClient;
+    result.readTimeoutMs = this.readTimeoutMs;
+    result.writeTimeoutMs = this.writeTimeoutMs;
+    result.connectTimeoutMs = this.connectTimeoutMs;
+    result.proxy = this.proxy;
+    return result;
+  }
+
   /**
    * 设置读超时
    *