Abstract:A new model reuse method of flight control system virtual prototype is proposed Based on the Systems Modeling Language(SysML) Components(BSC), namely US-BP(Unit, Structure; Behavior, Process) method, which can improve the methods of virtual prototype-oriented system analysis and description. Taking a certain type of four-rotor UAV as example, the implementation of the flight control system virtual prototype supporting model reuse is described—the simulation, design and implementation are based on SysML components and Simulink components simultaneously. It provides an important technology for the model reuse in the modeling and simulation of the flight control system.