The automatic landing system based on the LQG/LTR method has good robustness, which can resist strong wind shear. This paper gave a brief introduction to the principle of the LQG/LTR method and presented an LQG/LTR automatic landing controller design for a commercial airplane. Simulation results show that the LQG/LTR method works well on nonminimal system under certain conditions. The autolanding system designed can maintain good control effect with the presence of several disturbances such as wind shear and model uncertainty, hence achieving good robust stability.