For making an deep research on the takeoff capability of shipborne fighter plane in carrier fleet air defense, the foundations of establishing shipborne fighter plane engagement airspace are summed up, based on the analysis of the air defense warfare characteristics and the partition of the air defense warfare airspace. Then the effects of the primary factors on the takeoff capability of shipborne fighter plane in carrier fleet air defense are simulated after the model is established. The result of the simulation can supply reference to analyze engagement capability of shipborne fighter plane in carrier fleet air defense.