diff --git a/src/Essensoft.Paylink.Alipay/AlipayClient.cs b/src/Essensoft.Paylink.Alipay/AlipayClient.cs
index af349c55e..a7b31909f 100644
--- a/src/Essensoft.Paylink.Alipay/AlipayClient.cs
+++ b/src/Essensoft.Paylink.Alipay/AlipayClient.cs
@@ -113,7 +113,7 @@ public async Task<T> PageExecuteAsync<T>(IAlipayRequest<T> request, AlipayOption
                 if (reqMethod.ToUpperInvariant() == "GET")
                 {
                     var url = options.ServerUrl;
-                    if (txtParams != null && txtParams.Count > 0)
+                    if (txtParams.Count > 0)
                     {
                         if (url.Contains("?"))
                         {
@@ -289,7 +289,7 @@ private static void CheckResponseSign<T>(IAlipayRequest<T> request, string body,
                 throw new AlipayException("sign check fail: Body)} is Empty!");
             }
 
-            if (!isError || isError && !string.IsNullOrEmpty(signItem.Sign))
+            if (!isError || !string.IsNullOrEmpty(signItem.Sign))
             {
                 var rsaCheckContent = AlipaySignature.RSACheckContent(signItem.SignSourceData, signItem.Sign, options.AlipayPublicKey, options.SignType);
                 if (!rsaCheckContent)
@@ -479,7 +479,7 @@ private async Task CheckResponseCertSignAsync<T>(IAlipayRequest<T> request, stri
                 throw new AlipayException("cert check fail: Body)} is Empty!");
             }
 
-            if (!isError || isError && !string.IsNullOrEmpty(certItem.Sign))
+            if (!isError || !string.IsNullOrEmpty(certItem.Sign))
             {
                 var currentAlipayPublicKey = await _publicKeyManager.GetAlipayPublicKeyAsync(this, options, certItem.CertSN);
                 var rsaCheckContent = AlipaySignature.RSACheckContent(certItem.SignSourceData, certItem.Sign, currentAlipayPublicKey, options.SignType);