When the aircraft is on a cruise flight,it is required that the aircraft photoelectric system can automatically scan the ground targets,realizing seamless scanning in the region of flight path.A seamless ground scanning control algorithm for aircraft is studied.According to the conditions of flight velocity,flight height,the detectors field of view and detection distance,a group of optimal control parameters of the aircraft photoelectric system such as azimuth scanning range,angular velocity of azimuth scanning and pitch angle is calculated.Finally,the correctness and validity of the control algorithm are verified through Matlab simulation.