diff --git a/components/rtgui/common/font_bmp.c b/components/rtgui/common/font_bmp.c
index 36192c6244d3bab5789b84cfec4820f0fbc3736a..1e6bbeba0159cacf16d7a62da2af89b5e6bed182 100644
--- a/components/rtgui/common/font_bmp.c
+++ b/components/rtgui/common/font_bmp.c
@@ -156,7 +156,7 @@ static void rtgui_bitmap_font_get_metrics(struct rtgui_font* font, const char* t
 		if (bmp_font->char_width != NULL)
 		{
 			/* get width for each character */
-			while (*text < 0x80)
+			while (*text && (*text < 0x80))
 			{
 				rect->x2 += bmp_font->char_width[*text - bmp_font->first_char];
 				text ++;
diff --git a/components/rtgui/common/font_freetype.c b/components/rtgui/common/font_freetype.c
index 5e78b2666552f19f768853e937d02feeac8be689..dc231fc04b8e9301bd19343c857aa4f28489d8ff 100644
--- a/components/rtgui/common/font_freetype.c
+++ b/components/rtgui/common/font_freetype.c
@@ -2,8 +2,8 @@
 
 #ifdef RTGUI_USING_TTF
 #include <ft2build.h>
-#include <freetype/freetype.h>
-#include <freetype/ftglyph.h>
+#include <freetype/freetype.h>
+#include <freetype/ftglyph.h>
 
 static void rtgui_freetype_font_draw_text(struct rtgui_font* font, struct rtgui_dc* dc, const char* text, rt_ubase_t len, struct rtgui_rect* rect);
 static void rtgui_freetype_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect);
diff --git a/components/rtgui/common/image_jpg.c b/components/rtgui/common/image_jpg.c
index 189db5349235374f74e90d22ef631be7362ed02d..914655923089136b6443abc36c5f161b296a9f3f 100644
--- a/components/rtgui/common/image_jpg.c
+++ b/components/rtgui/common/image_jpg.c
@@ -1,10 +1,11 @@
+#include <rtthread.h>
+#include <rtgui/rtgui.h>
 
+#ifdef RTGUI_USING_JPEG
 #include <stdio.h>
 #include <stdlib.h>
 #include "jpeg/jpeglib.h"
 
-#include <rtthread.h>
-#include <rtgui/rtgui.h>
 #include <rtgui/rtgui_system.h>
 #include <rtgui/filerw.h>
 #include <rtgui/image_jpeg.h>
@@ -476,3 +477,4 @@ static rt_bool_t rtgui_image_jpeg_check(struct rtgui_filerw* file)
 	return is_JPG;
 }
 
+#endif
diff --git a/components/rtgui/common/image_png.c b/components/rtgui/common/image_png.c
index ff17bf275122a52b7d6dcffe715fe4133b421c2f..bb6e1b4bf8c57dfc3244d3566e6c5c905b70b30b 100644
--- a/components/rtgui/common/image_png.c
+++ b/components/rtgui/common/image_png.c
@@ -1,8 +1,10 @@
-#include "libpng/png.h"
 #include <rtthread.h>
-#include <rtgui/image_png.h>
 #include <rtgui/rtgui_system.h>
 
+#ifdef RTGUI_USING_PNG
+#include "libpng/png.h"
+#include <rtgui/image_png.h>
+
 #define PNG_MAGIC_LEN       8
 
 struct rtgui_image_png
@@ -328,3 +330,4 @@ void rtgui_image_png_init()
 	/* register png on image system */
 	rtgui_image_register_engine(&rtgui_image_png_engine);
 }
+#endif
diff --git a/components/rtgui/common/rtgui_system.c b/components/rtgui/common/rtgui_system.c
index 28071e6c28506abf51518bf7fc5154cd64e5ef9e..15843c51aa800de8c86e3f79b8768a76eca4a47a 100644
--- a/components/rtgui/common/rtgui_system.c
+++ b/components/rtgui/common/rtgui_system.c
@@ -403,7 +403,6 @@ rt_err_t rtgui_thread_send_urgent(rt_thread_t tid, rtgui_event_t* event, rt_size
 	struct rtgui_thread* thread;
 
 	rtgui_event_dump(tid, event);
-	rt_kprintf("event size: %d\n", event_size);
 
 	/* find rtgui_thread */
 	thread = (struct rtgui_thread*) (tid->user_data);
@@ -424,7 +423,6 @@ rt_err_t rtgui_thread_send_sync(rt_thread_t tid, rtgui_event_t* event, rt_size_t
 	struct rt_mailbox ack_mb;
 
 	rtgui_event_dump(tid, event);
-	rt_kprintf("event size: %d\n", event_size);
 
 	/* init ack mailbox */
 	r = rt_mb_init(&ack_mb, "ack", &ack_buffer, 1, 0);
diff --git a/components/rtgui/include/rtgui/dc.h b/components/rtgui/include/rtgui/dc.h
index f9276b676459d8a51a18dc489c5299df4b6184fc..866192cbb41015e462ef840689d4f877aed84ac1 100644
--- a/components/rtgui/include/rtgui/dc.h
+++ b/components/rtgui/include/rtgui/dc.h
@@ -68,7 +68,7 @@ struct rtgui_dc
 
 /* create a buffer dc */
 struct rtgui_dc* rtgui_dc_buffer_create(int width, int height);
-rt_uint8_t* rtgui_dc_buffer_get_pixel(struct rtgui_dc* dc);
+rt_uint8_t* rtgui_dc_buffer_get_pixel(struct rtgui_dc* dc);
 
 /* begin and end a drawing */
 struct rtgui_dc* rtgui_dc_begin_drawing(rtgui_widget_t* owner);
diff --git a/components/rtgui/include/rtgui/rtgui_config.h b/components/rtgui/include/rtgui/rtgui_config.h
index 1c69abec50baae942a0f849cb5a7f5488190efb0..225225a7a4fffef06dd6ba72d9a253c78919770a 100644
--- a/components/rtgui/include/rtgui/rtgui_config.h
+++ b/components/rtgui/include/rtgui/rtgui_config.h
@@ -26,7 +26,7 @@
 	/* support Chinese font */
 	#define RTGUI_USING_FONTHZ
 	/* support FreeType TTF font */
-	#define RTGUI_USING_TTF
+	// #define RTGUI_USING_TTF
 	/* use small size in RTGUI */
 	#define RTGUI_USING_SMALL_SIZE
 	/* use mouse cursor */
@@ -36,8 +36,8 @@
 
 	#define RTGUI_USING_STDIO_FILERW
 	#define RTGUI_IMAGE_BMP
-	#define RTGUI_IMAGE_PNG
-	#define RTGUI_IMAGE_JPEG
+	// #define RTGUI_IMAGE_PNG
+	// #define RTGUI_IMAGE_JPEG
 	#define RTGUI_USING_FONT12
 	#define RTGUI_USING_HZ_BMP
 	#define RTGUI_MEM_TRACE
diff --git a/components/rtgui/include/rtgui/widgets/combobox.h b/components/rtgui/include/rtgui/widgets/combobox.h
new file mode 100644
index 0000000000000000000000000000000000000000..e5243588343d4d0009603ca27a3b43469cb37991
--- /dev/null
+++ b/components/rtgui/include/rtgui/widgets/combobox.h
@@ -0,0 +1,53 @@
+#ifndef __RTGUI_COMBOBOX_H__
+#define __RTGUI_COMBOBOX_H__
+
+#include <rtgui/rtgui.h>
+#include <rtgui/image.h>
+#include <rtgui/widgets/window.h>
+
+/* combobox item */
+struct rtgui_combobox_item
+{
+    char* name;
+	rtgui_image_t *image;
+};
+
+/** Gets the type of a combobox */
+#define RTGUI_COMBOBOX_TYPE       (rtgui_combobox_type_get())
+/** Casts the object to a rtgui_combobox */
+#define RTGUI_COMBOBOX(obj)       (RTGUI_OBJECT_CAST((obj), RTGUI_COMBOBOX_TYPE, rtgui_combobox_t))
+/** Checks if the object is a rtgui_combobox */
+#define RTGUI_IS_COMBOBOX(obj)    (RTGUI_OBJECT_CHECK_TYPE((obj), RTGUI_COMBOBOX_TYPE))
+
+#define RTGUI_COMBOBOX_WIDTH		75
+#define RTGUI_COMBOBOX_HEIGHT		20
+#define RTGUI_COMBOBOX_BUTTON_WIDTH	18
+
+struct rtgui_combobox
+{
+	struct rtgui_widget parent;
+
+	/* widget private data */
+
+	/* pull down window */
+	struct rtgui_win* pd_win;
+	rt_bool_t pd_pressed;
+
+	/* combobox items */
+	struct rtgui_combobox_item* items;
+	rt_uint16_t items_count;
+	rt_uint16_t current_item;
+
+	/* call back */
+	rt_bool_t (*on_selected) (struct rtgui_widget* widget, struct rtgui_event* event);
+};
+typedef struct rtgui_combobox rtgui_combobox_t;
+
+rtgui_type_t *rtgui_combobox_type_get(void);
+rtgui_combobox_t *rtgui_combobox_create();
+void rtgui_combobox_destroy(rtgui_combobox_t* box);
+
+rt_bool_t rtgui_combobox_event_handler(struct rtgui_widget* widget, struct rtgui_event* event);
+struct rtgui_item* rtgui_combox_get_select(struct rtgui_combobox* box);
+
+#endif
diff --git a/components/rtgui/widgets/combobox.c b/components/rtgui/widgets/combobox.c
new file mode 100644
index 0000000000000000000000000000000000000000..7d17429bb8e4d977d3a3dc56bddaa7d9f1d238c9
--- /dev/null
+++ b/components/rtgui/widgets/combobox.c
@@ -0,0 +1,237 @@
+#include <rtgui/dc.h>
+#include <rtgui/widgets/combobox.h>
+
+static rt_bool_t rtgui_combobox_pulldown_hide(struct rtgui_widget* widget, struct rtgui_event* event);
+
+static void _rtgui_combobox_constructor(rtgui_combobox_t *box)
+{
+	rtgui_rect_t rect = {0, 0, RTGUI_COMBOBOX_WIDTH, RTGUI_COMBOBOX_HEIGHT};
+
+	/* init widget and set event handler */
+	rtgui_widget_set_event_handler(RTGUI_WIDGET(box), rtgui_combobox_event_handler);
+	rtgui_widget_set_rect(RTGUI_WIDGET(box), &rect);
+
+	RTGUI_WIDGET_TEXTALIGN(RTGUI_WIDGET(box)) = RTGUI_ALIGN_CENTER_VERTICAL;
+
+	box->pd_pressed = RT_FALSE;
+	box->current_item = 0;
+	box->on_selected = RT_NULL;
+
+	box->pd_win = rtgui_win_create(RT_NULL, "combo", &rect, RTGUI_WIN_STYLE_NO_TITLE);
+	box->pd_win->user_data = (rt_uint32_t)box;
+	rtgui_win_set_ondeactivate(RTGUI_WIN(box->pd_win), rtgui_combobox_pulldown_hide);
+}
+
+static void _rtgui_combobox_destructor(rtgui_combobox_t *box)
+{
+	/* destroy pull down window */
+	rtgui_win_destroy(box->pd_win);
+
+	/* reset box field */
+	box->pd_win    = RT_NULL;
+}
+
+rtgui_type_t *rtgui_combobox_type_get(void)
+{
+	static rtgui_type_t *combobox_type = RT_NULL;
+
+	if (!combobox_type)
+	{
+		combobox_type = rtgui_type_create("combobox", RTGUI_WIDGET_TYPE,
+			sizeof(rtgui_combobox_t),
+			RTGUI_CONSTRUCTOR(_rtgui_combobox_constructor),
+			RTGUI_DESTRUCTOR(_rtgui_combobox_destructor));
+	}
+
+	return combobox_type;
+}
+
+rtgui_combobox_t *rtgui_combobox_create()
+{
+	rtgui_combobox_t* box;
+
+	box = (rtgui_combobox_t*)rtgui_widget_create(RTGUI_COMBOBOX_TYPE);
+
+	return box;
+}
+
+void rtgui_combobox_destroy(rtgui_combobox_t* box)
+{
+	rtgui_widget_destroy(RTGUI_WIDGET(box));
+}
+
+static void rtgui_combobox_ondraw(struct rtgui_combobox* box)
+{
+	/* draw button */
+	struct rtgui_dc* dc;
+	struct rtgui_rect rect;
+
+	/* begin drawing */
+	dc = rtgui_dc_begin_drawing(RTGUI_WIDGET(box));
+	if (dc == RT_NULL) return;
+
+	/* get widget rect */
+	rtgui_widget_get_rect(RTGUI_WIDGET(box), &rect);
+	/* fill widget rect with background color */
+	rtgui_dc_fill_rect(dc, &rect);
+	rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_RAISE);
+
+	/* draw current item */
+	if (box->current_item < box->items_count)
+	{
+		rect.x1 += 5;
+		rtgui_dc_draw_text(dc, box->items[box->current_item].name, &rect);
+	}
+
+	/* draw pull down button */
+	rect.x1 = rect.x2 - RTGUI_COMBOBOX_BUTTON_WIDTH;
+	rtgui_rect_inflate(&rect, -1);
+	if (box->pd_pressed == RT_TRUE) rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_SUNKEN);
+	else rtgui_dc_draw_border(dc, &rect, RTGUI_BORDER_RAISE);
+	rtgui_dc_draw_arraw(dc, &rect, RTGUI_ARRAW_DOWN);
+
+	/* end drawing */
+	rtgui_dc_end_drawing(dc);
+	return;
+}
+
+static rt_bool_t rtgui_combobox_onmouse_button(struct rtgui_combobox* box, struct rtgui_event_mouse* event)
+{
+	struct rtgui_rect rect;
+
+	/* get widget rect */
+	rect = RTGUI_WIDGET(box)->extent;
+
+	/* move to the pull down button */
+	rect.x1 = rect.x2 - RTGUI_COMBOBOX_BUTTON_WIDTH;
+	if (rtgui_rect_contains_point(&rect, event->x, event->y) == RT_EOK)
+	{
+		/* handle mouse button on pull down button */
+		if (event->button & RTGUI_MOUSE_BUTTON_LEFT &&
+			event->button & RTGUI_MOUSE_BUTTON_DOWN)
+		{
+			box->pd_pressed = RT_TRUE;
+			rtgui_widget_update(RTGUI_WIDGET(box));
+		}
+		else if (event->button & RTGUI_MOUSE_BUTTON_LEFT &&
+			event->button & RTGUI_MOUSE_BUTTON_UP)
+		{
+			box->pd_pressed = RT_FALSE;
+			rtgui_widget_update(RTGUI_WIDGET(box));
+
+			/* pop pull down window */
+			if (box->pd_win != RT_NULL)
+			{
+				struct rtgui_rect r;
+				rtgui_box_t* pd_win_box;
+
+				r.x1 = RTGUI_WIDGET(box)->extent.x1;
+				r.y1 = RTGUI_WIDGET(box)->extent.y2 + 2;
+				r.x2 = RTGUI_WIDGET(box)->extent.x2;
+				r.y2 = r.y1 + box->pd_win_height;
+
+				rtgui_win_set_rect(RTGUI_WIN(box->pd_win), &r);
+				pd_win_box = (rtgui_box_t*) rtgui_container_get_first_child(RTGUI_CONTAINER(box->pd_win));
+				if (pd_win_box != RT_NULL)
+				{
+					RTGUI_WIDGET(pd_win_box)->extent = RTGUI_WIDGET(box->pd_win)->extent;
+					rtgui_box_layout(pd_win_box);
+				}
+
+				/* show combo box pull down window */
+				rtgui_win_show(RTGUI_WIN(box->pd_win), RT_FALSE);
+			}
+		}
+
+		return RT_TRUE;
+	}
+
+	return RT_FALSE;
+}
+
+rt_bool_t rtgui_combobox_event_handler(struct rtgui_widget* widget, struct rtgui_event* event)
+{
+	struct rtgui_combobox* box = (struct rtgui_combobox*)widget;
+
+	switch (event->type)
+	{
+	case RTGUI_EVENT_PAINT:
+#ifndef RTGUI_USING_SMALL_SIZE
+		if (widget->on_draw != RT_NULL) widget->on_draw(widget, event);
+		else
+#endif
+			rtgui_combobox_ondraw(box);
+
+		break;
+
+	case RTGUI_EVENT_MOUSE_BUTTON:
+		return rtgui_combobox_onmouse_button(box, (struct rtgui_event_mouse*)event);
+
+	case RTGUI_EVENT_FOCUSED:
+		{
+			/* item focused */
+			struct rtgui_item* item;
+			struct rtgui_event_focused* focused;
+
+			focused = (struct rtgui_event_focused*) event;
+
+			item = (struct rtgui_item*) (focused->widget);
+			if (item != RT_NULL)
+			{
+				if (box->pd_select != RT_NULL)
+				{
+					/* un-select old item */
+					rtgui_item_selected(box->pd_select, RT_FALSE);
+				}
+
+				box->pd_select = item;
+				if (box->on_selected != RT_NULL)
+				{
+					box->on_selected(RTGUI_WIDGET(box), RT_NULL);
+				}
+
+				/* hide pull down window */
+				rtgui_win_hiden(RTGUI_WIN(box->pd_win));
+				rtgui_combobox_ondraw(box);
+			}
+		}
+		break;
+	}
+
+	return RT_FALSE;
+}
+
+static rt_bool_t rtgui_combobox_pulldown_hide(struct rtgui_widget* widget, struct rtgui_event* event)
+{
+	struct rtgui_combobox* box;
+
+	if (widget == RT_NULL) return RT_TRUE;
+
+	box = (struct rtgui_combobox*) (((struct rtgui_win*)widget)->user_data);
+	if (box == RT_NULL) return RT_TRUE;
+
+	/* clear select item */
+	if (box->pd_select != RT_NULL)
+	{
+		rtgui_item_selected(box->pd_select, RT_FALSE);
+	}
+
+	/* hide pull down window */
+	rtgui_win_hiden(RTGUI_WIN(box->pd_win));
+
+	/* clear pull down button state */
+	box->pd_pressed = RT_FALSE;
+	rtgui_widget_update(RTGUI_WIDGET(box));
+
+	return RT_TRUE;
+}
+
+struct rtgui_item* rtgui_combox_get_select(struct rtgui_combobox* box)
+{
+	if ((box != RT_NULL) && (box->current_item < box->items_count))
+	{
+		return &(box->items[box->current_item]);
+	}
+
+	return RT_NULL;
+}