Abstract: The fault characteristic signal of the gear is usually hidden in the vibration signal of the gear,and the vibration signal is usually acquired by the acceleration sensor.Vibration signals collected at different locations typically have strong and weak noise interference.Therefore,it is especially important to find the sensitive location of the sensor for signal acquisition in signal acquisition.This paper uses the different fault state indicators in the fault characteristic parameter value analysis method as the reference basis.In the denoising method,the time domain synchronous averaging method which can significantly improve the signal-to-noise ratio is used for denoising.The analysis find that the vibration signal collected by the A04 sensor has less interference.Therefore,when the acceleration sensor collects the vibration fault signal of the gearbox,the best sensitive position should exist near the bearing housing.