Abstract: RF photoinjector is one kind of high-brightness electron beam sources. Now the better experimental results have been made on CAEP photoinjecter. 70A electron beam of 2MeV in energy is achieved ,10ps micropulse width of 81.25MHz repetition and 2.5us macropulse width of 3Hz repetition. The system works stable, and is made of the driving laser ,the RF cavity for the photoinjecter, the vacuum chamber for Cs2Te photocathode fabrication ,high power microwave system , the measurements, and etc. The driving laser is very important in the system, the output of the driving laser can reach 1uJ/micropulse at the fourth harmonics, and the timing jitter is below 2ps.