Taking the wearing debris sensor as the object, electromagnetic field principle and Biot-Savart Law ware utilized to establish the output model of the new type wearing debris sensor induction voltage as well as confirmed by experiment. Additionally, the change rule among the linearity, sensitivity of sensor and every parameter were analyzed. The results show that the sensor has a better linearity，but sensor's sensitivity and the linearity are bad while the examination abrasive size is bellow 100 m, therefore it obtains the high sensitivity by optimization the sensor with structure parameters and linear processing.