diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java
index b87b3168a..877688735 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java
@@ -263,6 +263,9 @@ public class WxPayConfig {
       throw new WxPayException("请确保apiV3Key值已设置");
     }
 
+    if(StringUtils.isNotBlank(this.getPrivateKeyString())){
+      this.setPrivateKeyString(Base64.getEncoder().encodeToString(this.getPrivateKeyString().getBytes()));
+    }
     InputStream keyInputStream = this.loadConfigInputStream(this.getPrivateKeyString(), this.getPrivateKeyPath(),
       this.privateKeyContent, "privateKeyPath");
     try {
diff --git a/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/config/WxPayConfigTest.java b/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/config/WxPayConfigTest.java
index 5a506e72f..72750e01c 100644
--- a/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/config/WxPayConfigTest.java
+++ b/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/config/WxPayConfigTest.java
@@ -1,7 +1,16 @@
 package com.github.binarywang.wxpay.config;
 
+import com.github.binarywang.wxpay.exception.WxPayException;
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+import org.bouncycastle.pqc.jcajce.provider.util.KeyUtil;
 import org.testng.annotations.Test;
 
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.SecureRandom;
+import java.security.Security;
+import java.util.Base64;
+
 /**
  * <pre>
  *  Created by BinaryWang on 2017/6/18.
@@ -44,4 +53,20 @@ public class WxPayConfigTest {
     payConfig.setKeyString("MIIKmgIBAzCCCmQGCS...");
     payConfig.initSSLContext();
   }
+
+
+  @Test
+  public void testInitApiV3HttpClient() throws Exception {
+    Security.addProvider(new BouncyCastleProvider());
+    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA","BC");
+    keyPairGenerator.initialize(2048,new SecureRandom());
+    KeyPair keyPair = keyPairGenerator.genKeyPair();
+    byte[] encoded = keyPair.getPrivate().getEncoded();
+    // 模拟用户配置
+    String privateKeyString = Base64.getEncoder().encodeToString(encoded);
+    payConfig.setPrivateKeyString(privateKeyString);
+    payConfig.setApiV3Key("Test");
+    payConfig.initApiV3HttpClient();
+  }
+
 }