In order to solve the communications blockage problem of the power supply controller in Lanzhou Heavy Ion Accelerator CSR,a PAC is designed for power controller by using the structure of FPGA+ARM.ARM is designed as the core processor,and FPGA is designed for power digital adjust algorithm.P2Ptechnology is embedded to the core processor ARM of the PAC.The technology of UDP holing is adopted.The schematic diagram of UDP Holing is shown in Fig.1.A direct communication connect is es- In order to solve the communications blockage problem of the power supply controller in Lanzhou Heavy Ion Accelerator CSR, a PAC is designed for power controller by using the structure of FPGA + ARM.ARM is designed as the core processor, and FPGA is designed for power digital adjust algorithm. P2 Technology is embedded to the core processor ARM of the PAC. The technology of UDP holing is adopted. The schematic diagram of UDP Holing is shown in FIG. 1. A direct communication connect is es-