diff --git a/include/cos_config.h b/include/cos_config.h
index 2679cfa..b52f172 100644
--- a/include/cos_config.h
+++ b/include/cos_config.h
@@ -28,6 +28,7 @@ class CosConfig {
         m_set_intranet_once(false),
         m_is_use_intranet(false),
         m_intranet_addr(""),
+        m_dest_domain(""),
         m_config_parsed(false) {}
 
   /// \brief CosConfig构造函数
@@ -46,6 +47,7 @@ class CosConfig {
         m_set_intranet_once(false),
         m_is_use_intranet(false),
         m_intranet_addr(""),
+        m_dest_domain(""),
         m_config_parsed(false) {}
 
   /// \brief CosConfig构造函数
@@ -65,6 +67,7 @@ class CosConfig {
         m_set_intranet_once(false),
         m_is_use_intranet(false),
         m_intranet_addr(""),
+        m_dest_domain(""),
         m_config_parsed(false) {}
 
   /// \brief CosConfig复制构造函数
@@ -79,6 +82,7 @@ class CosConfig {
     m_set_intranet_once = config.m_set_intranet_once;
     m_is_use_intranet = config.m_is_use_intranet;
     m_intranet_addr = config.m_intranet_addr;
+    m_dest_domain = config.m_dest_domain;
     m_config_parsed = config.m_config_parsed;
   }
 
@@ -94,6 +98,7 @@ class CosConfig {
     m_set_intranet_once = config.m_set_intranet_once;
     m_is_use_intranet = config.m_is_use_intranet;
     m_intranet_addr = config.m_intranet_addr;
+    m_dest_domain = config.m_dest_domain;
     m_config_parsed = config.m_config_parsed;
     return *this;
   }
@@ -166,6 +171,10 @@ class CosConfig {
 
   bool GetSetIntranetOnce() const {return m_set_intranet_once;}
 
+  void SetDestDomain(const std::string& domain);
+
+  const std::string& GetDestDomain() const;
+
   /// \brief 设置日志回调
   void SetLogCallback(const LogCallback log_callback);
 
@@ -189,6 +198,7 @@ class CosConfig {
   bool m_set_intranet_once;
   bool m_is_use_intranet;
   std::string m_intranet_addr;
+  std::string m_dest_domain;
   bool m_config_parsed;
 };
 
diff --git a/include/cos_defines.h b/include/cos_defines.h
index 9479e78..c3d46ae 100644
--- a/include/cos_defines.h
+++ b/include/cos_defines.h
@@ -11,7 +11,7 @@
 
 namespace qcloud_cos {
 
-#define COS_CPP_SDK_VERSON "v5.5.7"
+#define COS_CPP_SDK_VERSON "v5.5.8"
 
 /// 路径分隔符
 const std::string kPathDelimiter = "/";
diff --git a/include/op/base_op.h b/include/op/base_op.h
index 125b57f..0da31a8 100644
--- a/include/op/base_op.h
+++ b/include/op/base_op.h
@@ -45,6 +45,8 @@ class BaseOp {
   /// \brief 获取Token
   std::string GetTmpToken() const;
 
+  std::string GetDestDomain() const;
+
   /// \brief 封装了cos Service/Bucket/Object 相关接口的通用操作,
   ///        包括签名计算、请求发送、返回内容解析等
   ///
diff --git a/src/cos_api.cpp b/src/cos_api.cpp
index 0bd4851..2caa9a2 100644
--- a/src/cos_api.cpp
+++ b/src/cos_api.cpp
@@ -307,7 +307,8 @@ std::string CosAPI::GetObjectUrl(const std::string& bucket,
   } else {
     object_url = "http://";
   }
-  std::string destdomain = CosSysConfig::GetDestDomain();
+  std::string destdomain = m_config->GetDestDomain().empty() ? 
+                          CosSysConfig::GetDestDomain() : m_config->GetDestDomain();
   if (!destdomain.empty()) {
     object_url += destdomain;
   } else {
diff --git a/src/cos_config.cpp b/src/cos_config.cpp
index fae2a4a..fcfa723 100644
--- a/src/cos_config.cpp
+++ b/src/cos_config.cpp
@@ -18,6 +18,7 @@ CosConfig::CosConfig(const std::string& config_file)
       m_set_intranet_once(false),
       m_is_use_intranet(false),
       m_intranet_addr(""),
+      m_dest_domain(""),
       m_config_parsed(false) {
   if (InitConf(config_file)) {
     m_config_parsed = true;
@@ -183,6 +184,7 @@ bool CosConfig::InitConf(const std::string& config_file) {
   std::string str_value;
   if (JsonObjectGetStringValue(object, "DestDomain", &str_value)) {
     CosSysConfig::SetDestDomain(str_value);
+    m_dest_domain = str_value;
   }
 
   if (JsonObjectGetBoolValue(object, "IsDomainSameToHost", &bool_value)) {
@@ -258,6 +260,17 @@ std::string CosConfig::GetIntranetAddr() {
   return m_intranet_addr;
 }
 
+void CosConfig::SetDestDomain(const std::string& domain) 
+{
+  CosSysConfig::SetDestDomain(domain);
+  m_dest_domain = domain; 
+}
+
+const std::string& CosConfig::GetDestDomain() const 
+{ 
+  return m_dest_domain; 
+}
+
 void CosConfig::SetLogCallback(const LogCallback log_callback) {
   CosSysConfig::SetLogCallback(log_callback);
 }
diff --git a/src/cos_sys_config.cpp b/src/cos_sys_config.cpp
index 6e7fcd7..0729a94 100644
--- a/src/cos_sys_config.cpp
+++ b/src/cos_sys_config.cpp
@@ -58,6 +58,7 @@ unsigned CosSysConfig::m_dns_cache_expire_seconds = 600;
 unsigned CosSysConfig::m_dns_cache_size = 1000;
 
 std::mutex m_intranet_addr_lock;
+std::mutex m_dest_domain_lock;
 
 void CosSysConfig::PrintValue() {
   std::cout << "upload_part_size:" << m_upload_part_size << std::endl;
@@ -118,6 +119,7 @@ void CosSysConfig::SetDownSliceSize(unsigned slice_size) {
 }
 
 void CosSysConfig::SetDestDomain(const std::string& dest_domain) {
+  std::lock_guard<std::mutex> lock(m_dest_domain_lock);
   m_dest_domain = dest_domain;
 }
 
@@ -249,7 +251,10 @@ std::string CosSysConfig::GetCIHost(const std::string& bucket_name,
   return host;
 }
 
-std::string CosSysConfig::GetDestDomain() { return m_dest_domain; }
+std::string CosSysConfig::GetDestDomain() { 
+  std::lock_guard<std::mutex> lock(m_dest_domain_lock);
+  return m_dest_domain; 
+}
 
 std::string CosSysConfig::GetIntranetAddr() { 
   std::lock_guard<std::mutex> lock(m_intranet_addr_lock);
diff --git a/src/op/base_op.cpp b/src/op/base_op.cpp
index 143ec32..058f50f 100644
--- a/src/op/base_op.cpp
+++ b/src/op/base_op.cpp
@@ -38,6 +38,11 @@ std::string BaseOp::GetSecretKey() const { return m_config->GetSecretKey(); }
 
 std::string BaseOp::GetTmpToken() const { return m_config->GetTmpToken(); }
 
+std::string BaseOp::GetDestDomain() const {
+  return m_config->GetDestDomain().empty() ? 
+         CosSysConfig::GetDestDomain() : m_config->GetDestDomain();
+}
+
 CosResult BaseOp::NormalAction(const std::string& host, const std::string& path,
                                const BaseReq& req, const std::string& req_body,
                                bool check_body, BaseResp* resp) {
@@ -76,7 +81,7 @@ CosResult BaseOp::NormalAction(
   if (!CosSysConfig::IsDomainSameToHost()) {
     req_headers["Host"] = host;
   } else {
-    req_headers["Host"] = CosSysConfig::GetDestDomain();
+    req_headers["Host"] = GetDestDomain();
   }
 
   // 2. 计算签名
@@ -156,7 +161,7 @@ CosResult BaseOp::DownloadAction(const std::string& host,
   if (!CosSysConfig::IsDomainSameToHost()) {
     req_headers["Host"] = host;
   } else {
-    req_headers["Host"] = CosSysConfig::GetDestDomain();
+    req_headers["Host"] = GetDestDomain();
   }
 
   // 2. 计算签名
@@ -242,7 +247,7 @@ CosResult BaseOp::UploadAction(
   if (!CosSysConfig::IsDomainSameToHost()) {
     req_headers["Host"] = host;
   } else {
-    req_headers["Host"] = CosSysConfig::GetDestDomain();
+    req_headers["Host"] = GetDestDomain();
   }
 
   // 2. 计算签名
@@ -312,6 +317,8 @@ std::string BaseOp::GetRealUrl(const std::string& host, const std::string& path,
   } else if (CosSysConfig::IsUseIntranet() &&
       !CosSysConfig::GetIntranetAddr().empty()) {
     dest_host = CosSysConfig::GetIntranetAddr();
+  } else if (!m_config->GetDestDomain().empty()) {
+    dest_host = m_config->GetDestDomain();
   } else if (!CosSysConfig::GetDestDomain().empty()) {
     dest_host = CosSysConfig::GetDestDomain();
   } else if (CosSysConfig::GetUseDnsCache()) {
diff --git a/src/op/object_op.cpp b/src/op/object_op.cpp
index 0ba715e..bf80bfa 100644
--- a/src/op/object_op.cpp
+++ b/src/op/object_op.cpp
@@ -1151,7 +1151,7 @@ ObjectOp::MultiThreadDownload(const GetObjectByFileReq& req,
   if (!CosSysConfig::IsDomainSameToHost()) {
     headers["Host"] = host;
   } else {
-    headers["Host"] = CosSysConfig::GetDestDomain();
+    headers["Host"] = GetDestDomain();
   }
 
   const std::string& tmp_token = m_config->GetTmpToken();
@@ -1599,7 +1599,7 @@ void ObjectOp::FillUploadTask(const std::string& upload_id,
   if (!CosSysConfig::IsDomainSameToHost()) {
     req_headers["Host"] = host;
   } else {
-    req_headers["Host"] = CosSysConfig::GetDestDomain();
+    req_headers["Host"] = GetDestDomain();
   }
   std::string auth_str = AuthTool::Sign(GetAccessKey(), GetSecretKey(), "PUT",
                                         path, req_headers, req_params);
@@ -1630,7 +1630,7 @@ void ObjectOp::FillCopyTask(const std::string& upload_id,
   if (!CosSysConfig::IsDomainSameToHost()) {
     req_headers["Host"] = host;
   } else {
-    req_headers["Host"] = CosSysConfig::GetDestDomain();
+    req_headers["Host"] = GetDestDomain();
   }
 
   req_headers["x-cos-copy-source-range"] = range;
@@ -1651,8 +1651,8 @@ std::string ObjectOp::GeneratePresignedUrl(const GeneratePresignedUrlReq& req) {
   std::string auth_str = "";
 
   std::string host;
-  if (!CosSysConfig::GetDestDomain().empty()) {
-    host = CosSysConfig::GetDestDomain();
+  if (!m_config->GetDestDomain().empty() || !CosSysConfig::GetDestDomain().empty()) {
+    host = GetDestDomain();
   } else {
     host = CosSysConfig::GetHost(GetAppId(), m_config->GetRegion(),
                                            req.GetBucketName());
@@ -1885,7 +1885,7 @@ CosResult ObjectOp::ResumableGetObject(const GetObjectByFileReq& req,
   if (!CosSysConfig::IsDomainSameToHost()) {
     headers["Host"] = host;
   } else {
-    headers["Host"] = CosSysConfig::GetDestDomain();
+    headers["Host"] = GetDestDomain();
   }
 
   const std::string& tmp_token = m_config->GetTmpToken();