diff --git a/bsp/simulator/readme_en.txt b/bsp/simulator/readme_en.txt
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+compile bsp:
+There are two ways.
+1). Visual Studio(2005 or newer version), open vs2005.vcproj with visual studio
+    compile, then run it.
+   
+2). use scons, open cmd console, change  to current path, then do
+      scons -j4
+scons will compile this bsp with cl(the compiler of vs), then rtthrad-win32.exe will be created in current directory. Run it by double click it.
+
+run:
+  Run, then you can see the following message on CMD window.
+
+	 \ | /
+	- RT -     Thread Operating System
+	 / | \     1.1.0 build Oct 21 2012
+	 2006 - 2012 Copyright by rt-thread team
+	init jffs2 lock mutex okay
+	hello, world
+	finsh>>fatfs initialzation failed!
+	uffs initialzation failed!
+	jffs2 initialzation failed!
+	thread 29e4 exit
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	thread 2898 exit
+
+Then you may note that, three file (sd.bin, nand.bin, nor.bin) are created. These three files are used to simulate as SD CARD, nand flash and nor flash.
+		sd.bin--SD card, fatfs, 16M
+		nand.bin--nand flash, uffs, page=2048+64bytes, block=64pages, 16M
+		nor.bin--nor flash, jffs2, block size is 64K, 2M
+
+Note, it failed to mount fatfs,uffs and jffs2, because there is valid partition on sd card, and there is no directory to mount uffs and jffs2.
+
+So, we should mount sd card at first.
+Press ENTER, and run the command "mkfs", like, 
+
+	finsh>>mkfs("elm", "sd0")
+			0, 0x00000000
+	finsh>>
+
+Then close CMD, and then re-run it. This time, you can see that fatfs is mounted correctly, While uffs and jffs2 are still failed to mount for the reason that there is no any directories for uffs and jffs2.
+	 \ | /
+	- RT -     Thread Operating System
+	 / | \     1.1.0 build Oct 21 2012
+	 2006 - 2012 Copyright by rt-thread team
+	init jffs2 lock mutex okay
+	hello, world
+	finsh>>fatfs initialized!
+	uffs initialzation failed!
+	jffs2 initialzation failed!
+	
+so, in order to mount uffs and jffs2, we should create directories for them. Do the following commands.
+
+	finsh>>mkdir("/nand")
+			0, 0x00000000
+	finsh>>mkdir("/nor")
+			0, 0x00000000
+	finsh>>
+
+Close the CMD console, and restart, then you can see this:
+
+	 \ | /
+	- RT -     Thread Operating System
+	 / | \     1.1.0 build Oct 21 2012
+	 2006 - 2012 Copyright by rt-thread team
+	init jffs2 lock mutex okay
+	hello, world
+	finsh>>fatfs initialized!
+	os  : system memory alloc 320 bytes
+	flsh: ECC size 24
+	flsh: UFFS consume spare data size 34
+	os  : system memory alloc 83520 bytes
+	os  : system memory alloc 52400 bytes
+	os  : system memory alloc 2048 bytes
+	tree: DIR 0, FILE 0, DATA 0
+	uffs initialized!
+	jffs2 initialized!
+	thread 2fb4 exit
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	hello, world
+	thread 312c exit
+
+Ok, everything is okay, you can develop rt-thread with visual studio. 
+
+Any questions about this bsp, please email me,  goprife@gmail.com
+
+Enjoy~~
+                                            prife 2012/10/21