In the process of ultrasonic nondestructive testing, the movement track of the ultrasonic probe is needed to be tracked in real time, and the location of the wound is detected, and the independent positioning method based on motion sensor is proposed.The acceleration sensor and the gyro collect the data of acceleration and angular acceleration in real time ,and using the attitude matrix to eliminate the influence of the migration of gravity acceleration component after the filtering processing by Kalman filter.By experimental test, the method autonomy is strong, short-term high accuracy, completely accords with the demand of testing system for location information.