This paper summarizes a recent study of instrument simulation system for general aviation aircraft. As a component of avionics system for small aircraft, the Engine Indication System (EIS) displays critical engine, electrical, and fuel system information. This article introduces the cycle of developing the virtual instruments simulation with GL Studio software, designs EIS interface based on Federal Aviation Regulation, offers different EIS configurations for aircraft cockpit display system and uses the graphics designer and the code editor of GL Studio combined with VC++ to simulate EIS interface. The simulation result which has already been used can real-timely show the parameters, and it also shows that the simulation based on GL Studio software has good effect and high fidelity.