According to the requirements of the trajectory measurement in the load test for aircraft landing gear，a safe and reliable trajectory test and the monitor scheme are designed by using electro-optic theodolite (EOMS)，GPS (global position system) and total station positioning system（TPS110）etc. The methods of the aircraft trajectory，camera calibration and precision detection based on the image sequence are proposed，from the view of the photogrammetry and projective geometry. The analysis proves that the method of the measurement precision is better than 6 cm. The designed system has been used in flight test and has got a good application.