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In order to improve the measurement accuracy of the angle and signal processing speed of operation,this paper proposes a novel method of second harmonic measurement of multi-beam laser heterodyne for the angle,which based on the combination of Doppler effect and heterodyne technology,loaded the information of the angle to the frequency difference of second harmonic of the multi-beam laser heterodyne signal by frequency modulation of the oscillating mirror,which is in the light path.