diff --git a/components/libdl/SConscript b/components/libdl/SConscript
new file mode 100644
index 0000000000000000000000000000000000000000..df7c8814ca63575764cbc1168e1e0eed37d7cc2c
--- /dev/null
+++ b/components/libdl/SConscript
@@ -0,0 +1,26 @@
+Import('env')
+Import('projects')
+Import('RTT_ROOT')
+Import('rtconfig')
+
+# group definitions
+group = {}
+group['name'] = 'libdl'
+group['src'] = Glob('*.c')
+group['depend'] = 'RT_USING_LIBDL'
+group['CCFLAGS'] = ''
+group['CPPPATH'] = [RTT_ROOT + '/components/libdl']
+group['CPPDEFINES'] = ''
+group['LINKFLAGS'] = ''
+
+# add group to project list
+projects.append(group)
+
+env.Append(CCFLAGS = group['CCFLAGS'])
+env.Append(CPPPATH = group['CPPPATH'])
+env.Append(CPPDEFINES = group['CPPDEFINES'])
+env.Append(LINKFLAGS = group['LINKFLAGS'])
+
+objs = env.Object(group['src'])
+
+Return('objs')
diff --git a/components/libdl/dlclose.c b/components/libdl/dlclose.c
new file mode 100644
index 0000000000000000000000000000000000000000..e040a2139675e94c8b8a077b8035516067bec0b2
--- /dev/null
+++ b/components/libdl/dlclose.c
@@ -0,0 +1,36 @@
+/*
+ * File      : dlclose.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author		Notes
+ * 2010-11-17      yi.qiu	first version
+ */
+
+#include <rtthread.h>
+#include <rtm.h>
+
+int rt_dlclose (void *handle)
+{
+	rt_module_t module;
+	
+	RT_ASSERT(handle != RT_NULL);
+	
+	module = (rt_module_t)handle;
+	module->nref--;
+	
+	if(module->nref <= 0)
+	{
+		rt_module_unload(module);
+	}	
+
+	return RT_TRUE;
+}
+
+RTM_EXPORT(rt_dlclose)
+
diff --git a/components/libdl/dlerror.c b/components/libdl/dlerror.c
new file mode 100644
index 0000000000000000000000000000000000000000..a4728a8a88df2f5479bc5e257b052173b579c8d4
--- /dev/null
+++ b/components/libdl/dlerror.c
@@ -0,0 +1,24 @@
+/*
+ * File      : dlerror.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author		Notes
+ * 2010-11-17      yi.qiu	first version
+ */
+
+#include <rtthread.h>
+#include <rtm.h>
+
+const char *rt_dlerror(void)
+{
+	return "TODO";
+}
+
+RTM_EXPORT(rt_dlerror)
+
diff --git a/components/libdl/dlfcn.h b/components/libdl/dlfcn.h
new file mode 100644
index 0000000000000000000000000000000000000000..eea1d02d4bd02e20be84fe50cde39d8c87037eeb
--- /dev/null
+++ b/components/libdl/dlfcn.h
@@ -0,0 +1,16 @@
+#ifndef __DLFCN_H_
+#define __DLFCN_H_
+
+#define RTLD_LAZY       0x00000
+#define RTLD_NOW        0x00001
+
+#define RTLD_LOCAL      0x00000
+#define RTLD_GLOBAL     0x10000
+
+#define RTLD_DEFAULT    ((void*)1)
+#define RTLD_NEXT       ((void*)2)
+
+void *rt_dlopen (const char *filename, int flag);
+const char *rt_dlerror(void);
+void *rt_dlsym(void *handle, const char *symbol);
+int rt_dlclose (void *handle);
diff --git a/components/libdl/dlopen.c b/components/libdl/dlopen.c
new file mode 100644
index 0000000000000000000000000000000000000000..d392a945230a32d3640b3e7676323f9a8dba9f76
--- /dev/null
+++ b/components/libdl/dlopen.c
@@ -0,0 +1,39 @@
+/*
+ * File      : dlopen.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author		Notes
+ * 2010-11-17      yi.qiu	first version
+ */
+ 
+#include <rtthread.h>
+#include <rtm.h>
+
+void* rt_dlopen(const char *filename, int flags)
+{
+	rt_module_t module;
+	
+	RT_ASSERT(filename != RT_NULL);
+
+	/* find in module list */
+	module = rt_module_find(filename);
+	
+	if(module)
+	{
+		module->nref++;
+		return (void*)module;
+	}	
+	else
+	{
+		module = rt_module_open(filename);
+	}	
+}
+
+RTM_EXPORT(rt_dlopen)
+
diff --git a/components/libdl/dlsym.c b/components/libdl/dlsym.c
new file mode 100644
index 0000000000000000000000000000000000000000..d1b5266ce1ba035aed26be0eacfc8f220e7260f5
--- /dev/null
+++ b/components/libdl/dlsym.c
@@ -0,0 +1,35 @@
+/*
+ * File      : dlsym.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author		Notes
+ * 2010-11-17      yi.qiu	first version
+ */
+
+#include <rtthread.h>
+#include <rtm.h>
+
+void* rt_dlsym(void *handle, const char* symbol)
+{
+	int i;
+	rt_module_t module = (rt_module_t)handle;
+	
+	RT_ASSERT(handle != RT_NULL);
+
+	for(i=0; i<module->nsym; i++)
+	{
+		if (rt_strcmp(module->symtab[i].name, symbol) == 0)
+			return (void*)module->symtab[i].addr;
+	}	
+
+	return RT_NULL;
+}
+
+RTM_EXPORT(rt_dlsym)
+