Aiming at the problem of small field of view of long-range aerial camera, the large-scene ground imaging was realized by utilizing the small-array camera combined with the optical components of the system through the sweeping in the roll direction. The mathematical analysis of the sweeping process was carried out, and the scanning instructions required for sweeping were obtained. Several image motion compensation techniques commonly used at present were introduced, and various compensation methods were compared. The correctness of the mathematical formula was verified by simulation experiments. The simulation experiments show that the scanning command can be used to acquire large scene images on the ground by small array aerial camera.