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the low pressure turbine blade is the key to the military car engine parts.In view of the traditional military vehicles engine test system for low pressure turbine blade crack failure detection of real-time and accuracy problem of low,design of military vehicles engine low pressure turbine blade crack failure detection system.The system is mainly composed of blade frequency measuring experiment part and blade crack parts.Hardware part mainly include NI USB - 9233,PCB acceleration sensors,amplifiers,PYD MA - 600-1 type eddy current emergency force hammer fatigue tester,and PCB,etc;Software part mainly aimed at the blade crack detecting interface design,the main design of the detection system of the main interface,channel,detecting signal module and waveform display module. The last experiment,experiment of 20 test point on the blade hammer,on channel in the process of parameter Settings,you need to set up the channel 1 as a force,the channel 2 as blade crack signal response. The experimental results show that the algorithm of engine blade crack depth of 0.2 mm to 2 mm low pressure turbine blade detection accuracy reached 98%,32% higher than that of traditional algorithm,satisfactory results have been achieved.