To meet the requirements of military development, firstly, the framework of the fire control simulation system (FCSS) is designed; then establishes every mathematical model of the fire control system, including the test management subsystem model, the weapon management subsystem model, the flight control subsystem model, the sensor management subsystem model and the fire control task machine subsystem model; secondly, based on the embedded real-time operating system VxWorks, this paper realizes the functional modules of each subsystem, and on this basis realizes the communication among them; finally, two sets of simulation results are analyzed in air-attack. Simulation results show that: to ensure the stability and smoothness of the attack route, PL-8 is better in the air to air missile fire control attack, PL-12 is more suitable in the long-distance combat.