diff --git a/rtgui/common/rtgui_theme.c b/rtgui/common/rtgui_theme.c
index 0609ecdd2..4f5ea3eb0 100644
--- a/rtgui/common/rtgui_theme.c
+++ b/rtgui/common/rtgui_theme.c
@@ -37,8 +37,14 @@ extern struct rtgui_font rtgui_font_arial12;
 
 /* init theme */
 void rtgui_system_theme_init()
-{
-	rtgui_font_set_defaut(&rtgui_font_asc12);
+{
+#if RTGUI_DEFAULT_FONT_SIZE == 16
+	rtgui_font_set_defaut(&rtgui_font_asc16);
+#elif RTGUI_DEFAULT_FONT_SIZE == 12
+	rtgui_font_set_defaut(&rtgui_font_asc12);
+#else
+	rtgui_font_set_defaut(&rtgui_font_asc12);
+#endif
 }
 
 static const rt_uint8_t close_byte[14] = {0x06, 0x18, 0x03, 0x30, 0x01, 0xE0, 0x00,
diff --git a/rtgui/include/rtgui/rtgui_config.h b/rtgui/include/rtgui/rtgui_config.h
index c8c51c985..311007d71 100644
--- a/rtgui/include/rtgui/rtgui_config.h
+++ b/rtgui/include/rtgui/rtgui_config.h
@@ -27,6 +27,10 @@
 #define RTGUI_MEM_TRACE
 #endif
 
+#if RTGUI_DEFAULT_FONT_SIZE == 0
+#define RTGUI_DEFAULT_FONT_SIZE 12
+#endif
+
 #define RTGUI_SVR_THREAD_PRIORITY		15
 #define RTGUI_SVR_THREAD_TIMESLICE		5
 #ifdef RTGUI_USING_SMALL_SIZE