Aiming at the maneuvering training character of hovercraft, a visual simulation system is developed based on EPX-500 IG(Image Generator), and core-technology research is made, include the production of high revolution land database, simulation of sea waves and the detection of HOT(S) (Height of Terrain(Sea)) both on continent and sea surface. Consequentially gains the vivid simulation of hovercraft’s navigation scene, and the capability of real-time adjusting gesture of hovercraft in the motion simulation system module according to the response of the terrain.