diff --git a/src/main/java/com/gxwebsoft/common/core/utils/WechatPayDiagnostic.java b/src/main/java/com/gxwebsoft/common/core/utils/WechatPayDiagnostic.java
new file mode 100644
index 0000000..620d506
--- /dev/null
+++ b/src/main/java/com/gxwebsoft/common/core/utils/WechatPayDiagnostic.java
@@ -0,0 +1,222 @@
+package com.gxwebsoft.common.core.utils;
+
+import com.gxwebsoft.common.system.entity.Payment;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+/**
+ * 微信支付配置诊断工具
+ * 用于排查微信支付签名验证失败等问题
+ * 
+ * @author 科技小王子
+ * @since 2025-07-27
+ */
+@Slf4j
+@Component
+public class WechatPayDiagnostic {
+
+    /**
+     * 诊断微信支付配置
+     * 
+     * @param payment 支付配置
+     * @param privateKeyPath 私钥路径
+     * @param environment 环境标识
+     */
+    public void diagnosePaymentConfig(Payment payment, String privateKeyPath, String environment) {
+        log.info("=== 微信支付配置诊断开始 ===");
+        log.info("环境: {}", environment);
+        
+        // 1. 检查支付配置基本信息
+        checkBasicConfig(payment);
+        
+        // 2. 检查证书文件
+        checkCertificateFiles(payment, privateKeyPath, environment);
+        
+        // 3. 检查配置完整性
+        checkConfigCompleteness(payment);
+        
+        log.info("=== 微信支付配置诊断结束 ===");
+    }
+    
+    /**
+     * 检查基本配置信息
+     */
+    private void checkBasicConfig(Payment payment) {
+        log.info("--- 基本配置检查 ---");
+        
+        if (payment == null) {
+            log.error("❌ 支付配置为空");
+            return;
+        }
+        
+        log.info("支付配置ID: {}", payment.getId());
+        log.info("支付方式名称: {}", payment.getName());
+        log.info("支付类型: {}", payment.getType());
+        log.info("支付代码: {}", payment.getCode());
+        log.info("状态: {}", payment.getStatus());
+        
+        // 检查关键字段
+        checkField("应用ID", payment.getAppId());
+        checkField("商户号", payment.getMchId());
+        checkField("商户证书序列号", payment.getMerchantSerialNumber());
+        checkField("API密钥", payment.getApiKey(), true);
+    }
+    
+    /**
+     * 检查证书文件
+     */
+    private void checkCertificateFiles(Payment payment, String privateKeyPath, String environment) {
+        log.info("--- 证书文件检查 ---");
+        
+        // 检查私钥文件
+        if (privateKeyPath != null) {
+            checkFileExists("私钥文件", privateKeyPath);
+        }
+        
+        // 生产环境检查证书文件
+        if (!"dev".equals(environment)) {
+            if (payment.getApiclientCert() != null) {
+                log.info("商户证书文件配置: {}", payment.getApiclientCert());
+            }
+            
+            if (payment.getPubKey() != null) {
+                log.info("公钥文件配置: {}", payment.getPubKey());
+                log.info("公钥ID: {}", payment.getPubKeyId());
+            }
+        }
+    }
+    
+    /**
+     * 检查配置完整性
+     */
+    private void checkConfigCompleteness(Payment payment) {
+        log.info("--- 配置完整性检查 ---");
+        
+        boolean isComplete = true;
+        
+        if (isEmpty(payment.getMchId())) {
+            log.error("❌ 商户号未配置");
+            isComplete = false;
+        }
+        
+        if (isEmpty(payment.getMerchantSerialNumber())) {
+            log.error("❌ 商户证书序列号未配置");
+            isComplete = false;
+        }
+        
+        if (isEmpty(payment.getApiKey())) {
+            log.error("❌ API密钥未配置");
+            isComplete = false;
+        }
+        
+        if (isEmpty(payment.getAppId())) {
+            log.error("❌ 应用ID未配置");
+            isComplete = false;
+        }
+        
+        if (isComplete) {
+            log.info("✅ 配置完整性检查通过");
+        } else {
+            log.error("❌ 配置不完整，请补充缺失的配置项");
+        }
+    }
+    
+    /**
+     * 检查字段是否为空
+     */
+    private void checkField(String fieldName, String value) {
+        checkField(fieldName, value, false);
+    }
+    
+    /**
+     * 检查字段是否为空
+     */
+    private void checkField(String fieldName, String value, boolean isSensitive) {
+        if (isEmpty(value)) {
+            log.warn("⚠️ {}: 未配置", fieldName);
+        } else {
+            if (isSensitive) {
+                log.info("✅ {}: 已配置(长度:{})", fieldName, value.length());
+            } else {
+                log.info("✅ {}: {}", fieldName, value);
+            }
+        }
+    }
+    
+    /**
+     * 检查文件是否存在
+     */
+    private void checkFileExists(String fileName, String filePath) {
+        try {
+            File file = new File(filePath);
+            if (file.exists() && file.isFile()) {
+                log.info("✅ {}: 文件存在 - {}", fileName, filePath);
+                log.info("   文件大小: {} bytes", file.length());
+                
+                // 检查文件内容格式
+                if (filePath.endsWith(".pem")) {
+                    checkPemFileFormat(fileName, filePath);
+                }
+            } else {
+                log.error("❌ {}: 文件不存在 - {}", fileName, filePath);
+            }
+        } catch (Exception e) {
+            log.error("❌ {}: 检查文件时出错 - {} ({})", fileName, filePath, e.getMessage());
+        }
+    }
+    
+    /**
+     * 检查PEM文件格式
+     */
+    private void checkPemFileFormat(String fileName, String filePath) {
+        try {
+            String content = Files.readString(Paths.get(filePath));
+            if (content.contains("-----BEGIN") && content.contains("-----END")) {
+                log.info("✅ {}: PEM格式正确", fileName);
+            } else {
+                log.warn("⚠️ {}: PEM格式可能有问题", fileName);
+            }
+        } catch (Exception e) {
+            log.warn("⚠️ {}: 无法读取文件内容进行格式检查 ({})", fileName, e.getMessage());
+        }
+    }
+    
+    /**
+     * 检查字符串是否为空
+     */
+    private boolean isEmpty(String str) {
+        return str == null || str.trim().isEmpty();
+    }
+    
+    /**
+     * 生成诊断报告
+     */
+    public String generateDiagnosticReport(Payment payment, String environment) {
+        StringBuilder report = new StringBuilder();
+        report.append("🔍 微信支付配置诊断报告\n");
+        report.append("========================\n\n");
+        
+        report.append("环境: ").append(environment).append("\n");
+        report.append("租户ID: ").append(payment != null ? payment.getTenantId() : "未知").append("\n");
+        report.append("商户号: ").append(payment != null ? payment.getMchId() : "未配置").append("\n");
+        report.append("应用ID: ").append(payment != null ? payment.getAppId() : "未配置").append("\n\n");
+        
+        report.append("🚨 常见问题排查:\n");
+        report.append("1. 商户证书序列号是否正确\n");
+        report.append("2. APIv3密钥是否正确\n");
+        report.append("3. 私钥文件是否正确\n");
+        report.append("4. 微信支付平台证书是否过期\n");
+        report.append("5. 网络连接是否正常\n\n");
+        
+        report.append("💡 建议解决方案:\n");
+        report.append("1. 使用自动证书配置(RSAAutoCertificateConfig)\n");
+        report.append("2. 在微信商户平台重新下载证书\n");
+        report.append("3. 检查商户平台API安全设置\n");
+        
+        return report.toString();
+    }
+}
diff --git a/src/main/java/com/gxwebsoft/shop/service/impl/ShopOrderServiceImpl.java b/src/main/java/com/gxwebsoft/shop/service/impl/ShopOrderServiceImpl.java
index 3fa1c50..aea222d 100644
--- a/src/main/java/com/gxwebsoft/shop/service/impl/ShopOrderServiceImpl.java
+++ b/src/main/java/com/gxwebsoft/shop/service/impl/ShopOrderServiceImpl.java
@@ -11,6 +11,7 @@
   import com.gxwebsoft.common.core.utils.RedisUtil;
   import com.gxwebsoft.common.core.utils.CertificateLoader;
 import com.gxwebsoft.common.core.service.PaymentCacheService;
+  import com.gxwebsoft.common.core.utils.WechatPayDiagnostic;
   import com.gxwebsoft.common.system.entity.Payment;
   import lombok.extern.slf4j.Slf4j;
   import com.gxwebsoft.common.system.param.PaymentParam;
@@ -73,6 +74,8 @@ import com.gxwebsoft.common.core.service.PaymentCacheService;
     private PaymentCacheService paymentCacheService;
     @Resource
     private WechatCertAutoConfig wechatCertAutoConfig;
+    @Resource
+    private WechatPayDiagnostic wechatPayDiagnostic;
 
     @Override
     public PageResult<ShopOrder> pageRel(ShopOrderParam param) {
@@ -154,7 +157,14 @@ import com.gxwebsoft.common.core.service.PaymentCacheService;
       if (StrUtil.isNotBlank(payment.getNotifyUrl())) {
         request.setNotifyUrl(payment.getNotifyUrl().concat("/").concat(order.getTenantId().toString()));
       }
+      System.out.println("=== 发起微信支付请求 ===");
+      System.out.println("请求参数: " + request);
+
       PrepayWithRequestPaymentResponse response = service.prepayWithRequestPayment(request);
+
+      System.out.println("=== 微信支付响应成功 ===");
+      System.out.println("预支付ID: " + response.getPackageVal());
+
       orderInfo.put("provider", "wxpay");
       orderInfo.put("timeStamp", response.getTimeStamp());
       orderInfo.put("nonceStr", response.getNonceStr());
@@ -167,6 +177,26 @@ import com.gxwebsoft.common.core.service.PaymentCacheService;
         System.err.println("=== 创建微信支付订单失败 ===");
         System.err.println("错误信息: " + e.getMessage());
         System.err.println("错误类型: " + e.getClass().getName());
+
+        // 特殊处理签名验证失败的情况
+        if (e.getMessage() != null && e.getMessage().contains("signature is incorrect")) {
+          System.err.println("🔍 签名验证失败诊断:");
+          System.err.println("1. 检查商户证书序列号是否正确");
+          System.err.println("2. 检查APIv3密钥是否正确");
+          System.err.println("3. 检查私钥文件是否正确");
+          System.err.println("4. 检查微信支付平台证书是否过期");
+          System.err.println("5. 建议使用自动证书配置避免证书管理问题");
+          System.err.println("当前支付配置:");
+          try {
+            final Payment paymentInfo = getPayment(order);
+            System.err.println("  - 商户号: " + paymentInfo.getMchId());
+            System.err.println("  - 序列号: " + paymentInfo.getMerchantSerialNumber());
+            System.err.println("  - 环境: " + active);
+          } catch (Exception ex) {
+            System.err.println("  - 无法获取支付配置信息: " + ex.getMessage());
+          }
+        }
+
         e.printStackTrace();
         throw new RuntimeException("创建支付订单失败：" + e.getMessage(), e);
       }
@@ -257,6 +287,10 @@ import com.gxwebsoft.common.core.service.PaymentCacheService;
         String apiclientCert = null;
         String pubKey = null;
 
+        // 运行配置诊断
+        System.out.println("=== 运行微信支付配置诊断 ===");
+        wechatPayDiagnostic.diagnosePaymentConfig(payment, null, active);
+
       // 开发环境配置 - 使用自动证书配置
       if (active.equals("dev")) {
         // 构建包含租户号的证书路径: dev/wechat/{tenantId}/
@@ -278,6 +312,9 @@ import com.gxwebsoft.common.core.service.PaymentCacheService;
         System.out.println("私钥完整路径: " + privateKey);
         System.out.println("证书加载完成 - 私钥文件: " + privateKey);
         System.out.println("使用自动证书配置，无需手动加载微信支付平台证书");
+
+        // 更新诊断信息，包含私钥路径
+        wechatPayDiagnostic.diagnosePaymentConfig(payment, privateKey, active);
       } else {
         // 生产环境配置 - 从容器证书目录加载
         final String certRootPath = certConfig.getCertRootPath(); // /www/wwwroot/file.ws
@@ -358,23 +395,45 @@ import com.gxwebsoft.common.core.service.PaymentCacheService;
           throw new RuntimeException("微信支付配置失败，请先在商户平台开启API安全功能", e);
         }
       } else {
-        // 生产环境兼容公钥配置
-        if (payment.getPubKey() != null && !payment.getPubKey().isEmpty()) {
-          config = new RSAPublicKeyConfig.Builder()
-            .merchantId(payment.getMchId())
-            .privateKeyFromPath(privateKey)
-            .publicKeyFromPath(pubKey)
-            .publicKeyId(payment.getPubKeyId())
-            .merchantSerialNumber(payment.getMerchantSerialNumber())
-            .apiV3Key(payment.getApiKey())
-            .build();
-        } else {
-          config = new RSAConfig.Builder()
-            .merchantId(payment.getMchId())
-            .privateKeyFromPath(privateKey)
-            .merchantSerialNumber(payment.getMerchantSerialNumber())
-            .wechatPayCertificatesFromPath(apiclientCert)
-            .build();
+        // 生产环境优先使用自动证书配置
+        System.out.println("=== 生产环境使用自动证书配置 ===");
+        System.out.println("商户号: " + payment.getMchId());
+        System.out.println("序列号: " + payment.getMerchantSerialNumber());
+        System.out.println("API密钥: 已配置(长度:" + payment.getApiKey().length() + ")");
+
+        try {
+          // 优先使用自动证书配置，避免证书过期和序列号不匹配问题
+          config = wechatCertAutoConfig.createAutoConfig(
+            payment.getMchId(),
+            privateKey,
+            payment.getMerchantSerialNumber(),
+            payment.getApiKey()
+          );
+          System.out.println("✅ 生产环境自动证书配置成功");
+        } catch (Exception autoConfigException) {
+          System.err.println("⚠️ 自动证书配置失败，回退到手动证书配置");
+          System.err.println("自动配置错误: " + autoConfigException.getMessage());
+
+          // 回退到手动证书配置
+          if (payment.getPubKey() != null && !payment.getPubKey().isEmpty()) {
+            System.out.println("使用RSA公钥配置");
+            config = new RSAPublicKeyConfig.Builder()
+              .merchantId(payment.getMchId())
+              .privateKeyFromPath(privateKey)
+              .publicKeyFromPath(pubKey)
+              .publicKeyId(payment.getPubKeyId())
+              .merchantSerialNumber(payment.getMerchantSerialNumber())
+              .apiV3Key(payment.getApiKey())
+              .build();
+          } else {
+            System.out.println("使用RSA证书配置");
+            config = new RSAConfig.Builder()
+              .merchantId(payment.getMchId())
+              .privateKeyFromPath(privateKey)
+              .merchantSerialNumber(payment.getMerchantSerialNumber())
+              .wechatPayCertificatesFromPath(apiclientCert)
+              .build();
+          }
         }
       }