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It is very important to measure the speed of motor by using the incremental photoelectric encoder for the servo motion system. According to the requirement of frequency and real-time of the speed measuring system and combining with China’s own production of FPGA(Field－Programmable Gate Array)chip, it proposed a method by using domestic FPGA chip-CME M7 which embed ARM kernel as the developing platform of the hardware and Verilog HDL to programme to design a speed measuring circuit of motor of incremental photoelectric encoder based on domestic FPGA. Through the verification of the experiment, it is proved that the design of the speed measuring circuit is high precision, wide speed range, good real-time performance and strong anti-interference ability. 