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In order to solve the problem of inaccurate time on PC machine uses BIOS internal clock,this paper presents a design of network timing system based on Beidou / GPS chip.FPGA as the main control chip, it receives the Beidou /GPS dual mode chip to provide the UTC time stream, decodes and sends it through the network to the PC machine as a precise time.At the same time, multiple devices are connected with each other to realize data transmission between multiple devices, and the stability and reliability of the system is enhanced.Transmission rate up to 100 Mbps.The experiments proved that:Beidou /GPS receive signal stability, accurate transmission time information, the Beidou /GPS solution time information error is not more than 80 ns, 100 Mbps transmission rate error between device and PC in 1~2 ms, the system is stable and reliable.