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Designed a new kind of frequency measure system of grinder based on micro accelerator MMA8451Q and the high performance micro controller unit MSP430F5529. Begin with the sliding average filtering algorithm, the signal was disposed smoothly. The “virtual zero passing point” was calculated, and it was used to calculate the frequency of the vibration. According to the demarcate experiments on the vibration source, the validity and veracity of sliding average filtering algorithm and frequency measurement were proved. The max error was less than 0.2Hz, fiducial error was 0.25%. The practical measure experiment was done on the bent axle grinder, the result show that it was fit with the theoretical arithmetic result, and the system was feasible.