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At present, the detection accuracy of the engine frequency test system is low and the false alarm rate is too high. A new engine frequency test system is designed based on data mining. The system architecture is divided into three parts: data acquisition board, graphical interface and data processing software. The upper computer and the lower computer are connected by CAN bus. The data acquisition board is composed of sensors, power supply, acquisition module and memory. The graphic interface is composed of 16 channel high-speed data acquisition module, FPGA and labiviewfpga development platform to realize the system hardware design. The sensor signal conditioning circuit, a / D conversion circuit, C8051F040 single chip microcomputer and its can communication circuit are designed respectively. Through data mining, the frequency data of the engine frequency test system are clustered to realize the test display and test result preservation. Through can communication program, HT program and host program, the test data is transmitted to the graphical display interface, and the engine frequency test system based on data mining is designed. The experimental results show that the engine frequency test system based on data mining can effectively improve the detection rate of engine frequency test, reduce the system false alarm rate, and effectively reduce the engine frequency measurement false alarm.