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In this paper, we discuss an embedded digital measurement system based on FPGA for motor's speed. In order to overcome the shortcomings of T method and M method, the improved M/T method is used. According to the principle of improved method, the motor's speeding signals of four channels are measured and the communication with PMC bus is attained. The hardware of system is composed of photoelectric encoders, FPGA core chip, PMC bus, and the software of system which programmed with hard description language is composed of the frequency multiplication module, the direction judgment module, the speed measurement module and the data transfer interface module. This scheme makes full use of embedded technique, implement measurement of the motor's speed with less hardware. Eventually the simulation analyses of program in the Quartus II is gave in this paper. The results of simulation indicate this scheme is efficient, reliable, and can meet the requirements of measurement.