Abstract: Aiming at the photoelectric equipment working on the stationary base mast,a low cost measurement method of azimuth was presented. The azimuth variation of photoelectric equipment was computed by using two dip instruments to measure the angular velocity of the equipments pitch axis and roll axis and using one gyroscope to measure the angular velocity of the yaw axis. The real-time azimuth was computed when the beginning azimuth was gotten. The theory and system construction of the method were analyzed. The results of prototype test show that when using 0.01 dip instruments and 0.015/h gyro,the real-time azimuth precision is 0.09.