The dynamic simulation of IR sea scene with large area is an important part of simulation of 3D sea battlefield environment, which has great application value. Using the GPU shader technique, a simulation method of dynamic infrared sea scene was presented, which introduced texture of normal map, and achieved a lifelike sea infrared real-time simulation. Constructing the infrared sea module with rectangular plane, and the radiation character, radiation intensity and direction of sea surface with normal map in GPU shader were calculated. The dynamic wave simulational shader algorithm based on texture operation was used to realize the dynamic change of normal of pixel. In order to improve the real-time rendering efficiency, view point based scheduling and view field detecting technique were proposed. The experiment shows that the rendering speed of infrared sea scene created by the method can achieve 80 frame/s, meets the requirement of real-time simulation, and can simulate the effect of facula on mid band sea surface.