The hardware-in-the-loop system architecture of GPS simulator was presented,which was flexible,expansible and capable of real rime test,and a data-collecting GPS receiver was introduced into the system. The mathematic model of high-dynamic GPS signal was derived,and it was suggested to add two parameters to emulate high-dynamic effects. The structure of the simulator software was established. A software design instance and its simulation results were given. The simulator designed can provide a realistic hig...