diff --git a/app/scanner/cfg/gb_json.cpp b/app/scanner/cfg/gb_json.cpp
index 78bcedb3..2e38974d 100644
--- a/app/scanner/cfg/gb_json.cpp
+++ b/app/scanner/cfg/gb_json.cpp
@@ -428,6 +428,24 @@ namespace gb
         return false;
     }
 
+    int json::count()
+    {
+        if(!obj_ || !obj_->child)
+            return 0;
+
+        cJSON* child = obj_->child;
+        int     cnt = 0;
+
+        while(child)
+        {
+            cnt++;
+            child = child->next;
+        }
+
+        return cnt;
+    }
+
+
     bool json::first_child(std::string& val, std::string* name)
     {
         cur_child_ = obj_->child;
@@ -1368,10 +1386,15 @@ namespace gb
         else
             jsn_->set_value(name, hex_v.c_str());
     }
-    bool sane_config_schm::has_changed(void)
+    bool sane_config_schm::has_changed(int* items)
     {
+        if(items)
+            *items = jsn_ ? jsn_->count() : 0;
+
         if(!bkp_)
+        {
             return false;
+        }
 
         std::map<std::string, std::string>  old;
         std::string n(""), v("");
diff --git a/app/scanner/cfg/gb_json.h b/app/scanner/cfg/gb_json.h
index 98923760..ffc79d94 100644
--- a/app/scanner/cfg/gb_json.h
+++ b/app/scanner/cfg/gb_json.h
@@ -73,6 +73,7 @@ namespace gb
         bool get_value_as_string(const char* key, std::string& val, bool integer);
         bool get_as_array(const char* key, std::vector<std::string>& val);
 
+        int count(void);
         bool first_child(std::string& val, std::string* name = NULL);
         bool next_child(std::string& val, std::string* name = NULL);
 
@@ -148,7 +149,7 @@ namespace gb
         void config_changed(int sn, const char* val, size_t bytes, bool extra = false);
         void remove_config(const char* name);
         void set_value(const char* name, const char* val, size_t bytes, bool extra = false);
-        bool has_changed(void);
+        bool has_changed(int* items = nullptr);
         void end_setting(bool cancel);
         int id_from_name(const char* name);
         std::string to_text_stream(bool b64 = true, bool with_ver = true);
diff --git a/app/scanner/hg_settingdialog.cpp b/app/scanner/hg_settingdialog.cpp
index 5dd919c3..28c1dc8e 100644
--- a/app/scanner/hg_settingdialog.cpp
+++ b/app/scanner/hg_settingdialog.cpp
@@ -18,7 +18,7 @@ hg_settingdialog::hg_settingdialog(void *handle, QWidget *parent
     : QDialog(parent)
     , dev_que_(dev), save_(false)
     , btn_cut_area_(nullptr), btn_gamma_(nullptr), clicked_gamma_(false)
-    , custom_area_lable_(nullptr), comb_(nullptr),m_cover(true)
+    , custom_area_lable_(nullptr), comb_(nullptr)
 {
     std::string n(dev->opened_scanner_name());
     for(int i = 0; i < dev->scanners(); ++i)
@@ -1533,14 +1533,15 @@ bool hg_settingdialog::createMsgBoxUi(bool add, std::string &name)
     label_name->setVisible(false);
     m_lineEdit_name->setVisible(false);
 
-    connect(radioButtonCover, &QRadioButton::clicked, this, [=, &add, this](){
-        m_cover = true;
+    bool cover = true;
+    connect(radioButtonCover, &QRadioButton::clicked, this, [=, &add, &cover](){
+        cover = true;
         add = false;
         label_name->setVisible(false);
         m_lineEdit_name->setVisible(false);
     });
-    connect(radioButtonNew, &QRadioButton::clicked, this, [=, &add, this](){
-        m_cover = false;
+    connect(radioButtonNew, &QRadioButton::clicked, this, [=, &add, &cover](){
+        cover = false;
         add = true;
         label_name->setVisible(true);
         m_lineEdit_name->setVisible(true);
@@ -1552,7 +1553,8 @@ bool hg_settingdialog::createMsgBoxUi(bool add, std::string &name)
     QSpacerItem *spacer2 = new QSpacerItem(20, 20, QSizePolicy::Expanding);
     QPushButton *pbtnOk = new QPushButton;
     pbtnOk->setText(tr("ok"));
-    connect(pbtnOk, &QPushButton::clicked, this, [=, &name,this](){
+    connect(pbtnOk, &QPushButton::clicked, this, [=, &name, &cover](){
+
         QString text = m_lineEdit_name->text();
         static QRegularExpression re("\\s");
             text.remove(re);//Remove space
@@ -1566,7 +1568,7 @@ bool hg_settingdialog::createMsgBoxUi(bool add, std::string &name)
             return;
         }
 
-        if (!m_cover)
+        if (!cover)
         {
             std::vector<std::string> now;
             cur_cfg_->get_all_schemes(now);
@@ -1663,10 +1665,17 @@ void hg_settingdialog::save_scheme(void)
     }
     else
     {
-        add = cur_scheme_->has_changed();
+        int items = 0;
+        add = cur_scheme_->has_changed(&items);
         if(add)
         {
-            add = createMsgBoxUi(add, name);
+            if(items == 0) // while shemes is default
+            {
+                cur_cfg_->select_scheme(nullptr);
+                return;
+            }
+            else
+                add = createMsgBoxUi(add, name);
         }
     }
     if(add)
diff --git a/app/scanner/hg_settingdialog.h b/app/scanner/hg_settingdialog.h
index 230bd0cc..72f71ad3 100644
--- a/app/scanner/hg_settingdialog.h
+++ b/app/scanner/hg_settingdialog.h
@@ -124,7 +124,6 @@ private:
     double m_cutBottomValue; // 单位是毫米
 
     int m_colorModeId;
-    volatile bool m_cover = true;
     QString m_colorModeValue;
     SANE_Gamma m_gammaData;
     QComboBox       *comb_;