please help me to identify this driver.
AFAIK this is no driver which is for sale individually. It seems to be a very low budget 3-mode (done by the YK01, hi-medium-strobe) driver with next mode memory.
And welcome to BLF, minhui! Mind telling us the background of your question?
looks an awful lot like this one:
which I found from a Russian flashlight enthusiast forum: http://forum.fonarevka.ru/archive/index.php/t-2218.html?language=en. It seems that the driver came from a very cheap light from china, on which the markings were "BAILONG POLICE 30w", which means they were probably manufactured by Yiwu Bailong: http://zjbolong.en.alibaba.com/