diff --git a/sdk/sane_opt_json/base_opt.cpp b/sdk/sane_opt_json/base_opt.cpp
index d13572a..3a7dcca 100644
--- a/sdk/sane_opt_json/base_opt.cpp
+++ b/sdk/sane_opt_json/base_opt.cpp
@@ -91,10 +91,7 @@ char* sane_opt_provider::get_value(const char* name, void* value, size_t* size,
 }
 int sane_opt_provider::set_value(const char* name, void* val)
 {
-	if (following_.count(name))
-		return following_[name]->set_value(name, val);
-	else
-		return SCANNER_ERR_DEVICE_NOT_SUPPORT;
+	return SCANNER_ERR_DEVICE_NOT_SUPPORT;
 }
 void sane_opt_provider::enable(const char* name, bool able)
 {}
diff --git a/sdk/sane_opt_json/device_opt.cpp b/sdk/sane_opt_json/device_opt.cpp
index 104bf46..9a1c87f 100644
--- a/sdk/sane_opt_json/device_opt.cpp
+++ b/sdk/sane_opt_json/device_opt.cpp
@@ -1152,13 +1152,42 @@ void device_option::insert_option(gb_json* opt, sane_opt_provider* from, const c
 	}
 	else
 	{
-		int	index = -1;
+	int	index = -1, pos = -1;
 
 		if (group)
 			index = insert_group(group, group);
-		index = next_group(index + 1);
 
+		// insert poisition according to 'ui-pos'
+		if (!opt->get_value("ui-pos", pos) || pos == -1)
+		{
+			index = next_group(index + 1);
+		}
+		else
+		{
+			for (index++; index < origin_->children(); ++index)
+			{
+				gb_json*	sib = origin_->child(index);
+				std::string t("");
+				int			sit = -1;
+
+				if (!sib->get_value("type", t) || t == JSON_SANE_TYPE_GROUP)
+				{
+					sib->release();
+					break;
+				}
+				if (!sib->get_value("ui-pos", sit) || sit == -1)
+				{
+					sib->release();
+					break;
+				}
+				sib->release();
+
+				if (pos < sit)
+					break;
+			}
+		}
 		origin_->insert(index, opt->key().c_str(), opt);
+
 		src_[opt->key()] = from;
 		from->add_ref();
 	}
@@ -1920,7 +1949,7 @@ std::string device_option::get_name_by_sane_id(int sane_ind)
 
 	return std::move(value);
 }
-std::string device_option::get_option_value_type(const char* name)
+std::string device_option::get_option_value_type(const char* name, size_t* size)
 {
 	std::string value("");
 	gb_json* jsn = now_ ? now_ : origin_;
@@ -1933,6 +1962,12 @@ std::string device_option::get_option_value_type(const char* name)
 		if (child)
 		{
 			child->get_value("type", value);
+			if (size)
+			{
+				int	v = 0;
+				child->get_value("size", v);
+				*size = v;
+			}
 			child->release();
 		}
 	}
@@ -2009,7 +2044,7 @@ std::string device_option::get_option_field_string(const char* name, const char*
 
 	return std::move(value);
 }
-std::string device_option::get_option_value_type(int sane_ind)
+std::string device_option::get_option_value_type(int sane_ind, size_t* size)
 {
 	std::string value("");
 	gb_json* jsn = now_ ? now_ : origin_;
@@ -2018,6 +2053,12 @@ std::string device_option::get_option_value_type(int sane_ind)
 	{
 		gb_json* child = now_->child(sane_ind - 1);
 		child->get_value("type", value);
+		if (size)
+		{
+			int	v = 0;
+			child->get_value("size", v);
+			*size = v;
+		}
 		child->release();
 	}
 
diff --git a/sdk/sane_opt_json/device_opt.h b/sdk/sane_opt_json/device_opt.h
index 575c175..0b4d950 100644
--- a/sdk/sane_opt_json/device_opt.h
+++ b/sdk/sane_opt_json/device_opt.h
@@ -362,8 +362,8 @@ public:
 	int count(void);	// return option count
 	bool is_auto_restore_default(const char* name);
 	std::string get_name_by_sane_id(int sane_ind);
-	std::string get_option_value_type(const char* name);
-	std::string get_option_value_type(int sane_ind);
+	std::string get_option_value_type(const char* name, size_t* size = nullptr);
+	std::string get_option_value_type(int sane_ind, size_t* size = nullptr);
 	std::string get_option_field_string(const char* name, const char* key);
 	std::string get_option_value(const char* name, int type/*OPT_VAL_xxx*/, int* size = nullptr, void* in_data = nullptr);	// return whole json-text if name was null
 	std::string get_option_value(int sane_ind, int type/*OPT_VAL_xxx*/, int* size = nullptr, void* in_data = nullptr);	// return whole json-text if name was null