diff --git a/src/slic3r/GUI/MultiMachine.cpp b/src/slic3r/GUI/MultiMachine.cpp
index 7be604ec0..f22994e79 100644
--- a/src/slic3r/GUI/MultiMachine.cpp
+++ b/src/slic3r/GUI/MultiMachine.cpp
@@ -216,6 +216,9 @@ std::vector<DeviceItem*> selected_machines(const std::vector<DeviceItem*>& dev_i
 
 SortItem::SortItem()
 {
+    sort_map.emplace(std::make_pair(SortRule::SR_None, [this](const DeviceItem* d1, const DeviceItem* d2) {
+        return d1->state_dev_name > d2->state_dev_name;
+    }));
     sort_map.emplace(std::make_pair(SortRule::SR_DEV_NAME, [this](const DeviceItem* d1, const DeviceItem* d2) {
         return this->big ? d1->state_dev_name > d2->state_dev_name : d1->state_dev_name < d2->state_dev_name;
     }));
diff --git a/src/slic3r/GUI/MultiTaskManagerPage.cpp b/src/slic3r/GUI/MultiTaskManagerPage.cpp
index 3cdb5b3ce..cc24655d4 100644
--- a/src/slic3r/GUI/MultiTaskManagerPage.cpp
+++ b/src/slic3r/GUI/MultiTaskManagerPage.cpp
@@ -553,7 +553,6 @@ LocalTaskManagerPage::LocalTaskManagerPage(wxWindow* parent)
     m_select_checkbox = new CheckBox(m_table_head_panel, wxID_ANY);
     m_select_checkbox->SetMinSize(wxSize(FromDIP(TASK_LEFT_PRINTABLE), FromDIP(DEVICE_ITEM_MAX_HEIGHT)));
     m_select_checkbox->SetMaxSize(wxSize(FromDIP(TASK_LEFT_PRINTABLE), FromDIP(DEVICE_ITEM_MAX_HEIGHT)));
-    m_table_head_sizer->AddSpacer(FromDIP(TASK_LEFT_PADDING_LEFT));
     m_table_head_sizer->Add(m_select_checkbox, 0, wxALIGN_CENTER_VERTICAL, 0);
 
     m_select_checkbox->Bind(wxEVT_TOGGLEBUTTON, [this](wxCommandEvent& e) {
@@ -756,8 +755,8 @@ void LocalTaskManagerPage::refresh_user_device(bool clear)
     auto task_manager = wxGetApp().getTaskManager();
     if (task_manager) {
         auto m_task_obj_list = task_manager->get_local_task_list();
-        
-        for (auto it = m_task_obj_list.begin(); it != m_task_obj_list.end(); it++) {
+
+        for (auto it = m_task_obj_list.rbegin(); it != m_task_obj_list.rend(); ++it) {
 
             TaskStateInfo* task_state_info = it->second;
 
@@ -794,7 +793,7 @@ void LocalTaskManagerPage::refresh_user_device(bool clear)
             task_temps.push_back(mtitem);
         }
 
-        if (m_sort.rule != SortItem::SortRule::SR_None) {
+        if (m_sort.rule != SortItem::SortRule::SR_None && m_sort.rule != SortItem::SortRule::SR_SEND_TIME) {
             std::sort(task_temps.begin(), task_temps.end(), m_sort.get_call_back());
         }
 
diff --git a/src/slic3r/GUI/MultiTaskManagerPage.hpp b/src/slic3r/GUI/MultiTaskManagerPage.hpp
index b463f048e..40341560e 100644
--- a/src/slic3r/GUI/MultiTaskManagerPage.hpp
+++ b/src/slic3r/GUI/MultiTaskManagerPage.hpp
@@ -88,7 +88,7 @@ public:
 
 private:
     SortItem                    m_sort;
-    std::map<std::string, MultiTaskItem*> m_task_items;
+    std::map<int, MultiTaskItem*> m_task_items;
     bool                        device_name_big{ true };
     bool                        device_state_big{ true };
     bool                        device_send_time{ true };
diff --git a/src/slic3r/GUI/SendMultiMachinePage.cpp b/src/slic3r/GUI/SendMultiMachinePage.cpp
index ced9fb397..6cb719dbd 100644
--- a/src/slic3r/GUI/SendMultiMachinePage.cpp
+++ b/src/slic3r/GUI/SendMultiMachinePage.cpp
@@ -1230,8 +1230,8 @@ wxPanel* SendMultiMachinePage::create_page()
 
     // add send option
     wxBoxSizer* title_send_option = create_item_title(_L("Send Options"), main_page, "");
-    wxBoxSizer* max_printer_send = create_item_input(_L("Send"), _L("printers at the same time"), main_page, "", "max_send");
-    wxBoxSizer* delay_time = create_item_input(_L("Wait"), _L("minute each batch"), main_page, "", "sending_interval");
+    wxBoxSizer* max_printer_send = create_item_input(_L("Send"), _L("printers at the same time.(It depends on how many devices can undergo heating at the same time.)"), main_page, "", "max_send");
+    wxBoxSizer* delay_time = create_item_input(_L("Wait"), _L("minute each batch.(It depends on how long it takes to complete the heating.)"), main_page, "", "sending_interval");
     sizer->Add(title_send_option, 0, wxEXPAND, 0);
     sizer->Add(max_printer_send, 0, wxLEFT, FromDIP(20));
     sizer->AddSpacer(FromDIP(3));
diff --git a/src/slic3r/GUI/TaskManager.cpp b/src/slic3r/GUI/TaskManager.cpp
index 0de31566a..f011e10ce 100644
--- a/src/slic3r/GUI/TaskManager.cpp
+++ b/src/slic3r/GUI/TaskManager.cpp
@@ -284,9 +284,9 @@ void TaskManager::stop()
         m_scedule_thread.join();
 }
 
-std::map<std::string, TaskStateInfo*> TaskManager::get_local_task_list()
+std::map<int, TaskStateInfo*> TaskManager::get_local_task_list()
 {
-    std::map<std::string, TaskStateInfo*> out;
+    std::map<int, TaskStateInfo*> out;
     m_map_mutex.lock();
     for (auto it = m_cache_map.begin(); it != m_cache_map.end(); it++) {
         for (auto iter = (*it).tasks.begin(); iter != (*it).tasks.end(); iter++) {
@@ -295,7 +295,7 @@ std::map<std::string, TaskStateInfo*> TaskManager::get_local_task_list()
                 || (*iter)->state() == TaskState::TS_SEND_CANCELED
                 || (*iter)->state() == TaskState::TS_SEND_COMPLETED
                 || (*iter)->state() == TaskState::TS_SEND_FAILED) {
-                out.insert(std::make_pair(std::to_string((*iter)->task_info_id), *iter));
+                out.insert(std::make_pair((*iter)->task_info_id, *iter));
             }
         }
     }
diff --git a/src/slic3r/GUI/TaskManager.hpp b/src/slic3r/GUI/TaskManager.hpp
index caaae368f..e4aa8627e 100644
--- a/src/slic3r/GUI/TaskManager.hpp
+++ b/src/slic3r/GUI/TaskManager.hpp
@@ -150,7 +150,7 @@ public:
     void start();
     void stop();
 
-    std::map<std::string, TaskStateInfo*> get_local_task_list();
+    std::map<int, TaskStateInfo*> get_local_task_list();
 
     /* curr_page is start with 0 */
     std::map<std::string, TaskStateInfo> get_task_list(int curr_page, int page_count, int& total);