The motion parameters of aircraft and its external store can be obtained by photoelectric theodolite in flight test,but due to large distance measured or target blocked,it’s difficult to capture target very fast.After adding GPS receiver on the aircraft,we can get geodetic coordinate in real time.After the real-time acquisition data coded thought the telemetry channel,the ground machine can demodulate coordinate of the aircraft .The PCM data Stream can be received from the airborne transmission stream through the PCM telemetry receiving channel which is integrated on photoelectric theodolite.At the same time,the geodetic coordinate of aircraft can be demodulated from the data stream in real time.By this way,the external guide for photoelectric theodolite can be achieved after the data processed and transmitted to the control system of photoelectric theodolite.Application results show that the guided precision has good performance in the remote target capture and good results in practical application of this technique for photoelectric theodolite.