Automatic carrier landing system modeling is the key part of construction of simulation system. Firstly, the fundamental of automatic carrier landing system is expounded. Then, on the foundation of automatic carrier landing guidance and control structure, the wave and carrier deck motion equations, carrier air wake model, deck motion compensation model and aircraft induct model are established. Finally, the simulation modules are divided with the blocking design concept in terms of different functions, and, the input and output paths are defined. The design of carrier landing simulation system is accomplished by constructing the simulation program flow.