RF power sources of the storage ring for SSRF

3 sets of 500 MHz 300kW RF amplifiers to be used at the main ring of the Shanghai Synchrotron Radiation Facility (SSRF) have been installed on site. The Site Acceptance Test (SAT) of the first RF power source was completed in last March. The second and third RF power sources are going well and will be finished in October. The type choice, the layout of the RF power sources and the comparison between the SAT conclusion and the design goals are presented.