diff --git a/KS3/KS3Client.cs b/KS3/KS3Client.cs
index 06246cae3487aebf1013a06c9dbe699390268b70..7d81aa2f9c14dcb2cd7ccd922c503d7e5b5e71b4 100644
--- a/KS3/KS3Client.cs
+++ b/KS3/KS3Client.cs
@@ -4,7 +4,7 @@ using System.Linq;
 using System.Text;
 using System.IO;
 using System.Security.Cryptography;
-
+using System.Text.RegularExpressions;
 using KS3.Model;
 using KS3.Auth;
 using KS3.Http;
@@ -965,7 +965,7 @@ namespace KS3
          * Three parameters needed to be set
          * 1. http method (GET, PUT, HEAD or DELETE)
          * 2. endpoint (http or https, and the host name. e.g. http://ks3-cn-beijing.ksyuncs.com)
-         * 3. resource path (bucketName/[key], e.g. my-bucket/my-object)
+         * 3. resource path (bucketName/[key], e.g. my-bucket/my-object)
          * 4. support Third-level Domain Name, e.g. my-bucket.endpoint/my-object
          */
         private Request<X> createRequest<X>(String bucketName, String key, X originalRequest, HttpMethod httpMethod) where X : KS3Request 
@@ -976,7 +976,7 @@ namespace KS3
             String host = endpoint.Host;
             Uri newEndpoint = endpoint;
             var newUriBuilder = new UriBuilder(endpoint);
-            if (bucketName != null && !host.StartsWith(bucketName)) {
+            if (bucketName != null && !host.StartsWith(bucketName)) {
                 newUriBuilder.Host = bucketName + '.' + host;
                 newEndpoint = newUriBuilder.Uri;
             }
@@ -1107,6 +1107,8 @@ namespace KS3
         private static string filterSpecial(string key) {
             if(!String.IsNullOrEmpty(key)){
                 key = key.Replace("%5C","/").Replace("//", "/%2F").Replace("%28", "(").Replace("%29",")");
+                key = Regex.Replace(key, "%7E", "~", RegexOptions.IgnoreCase);
+
             }
             return key;
         }