A personnel and machine protection system for the picosecond accelerator has been built. The key of the system is to send on/off of three triggering signals which are those of electron gun

2856 MHz and 476 MHz

respectively

to ensure the safety of users and the accelerator. This paper describes the emergencies interlocked by ADAM5511 and timing trigger processor

and some secondary functions which improve the efficiency of the protection system completed in upper layer software.