Abstract: It has important theoretical significance and application value to study the real-time simulation technology of infrared sea background. Considering the conditions of existing computer software and hardware，a sea background infrared real-time simulation method was presented, which introduced a variety of optimization techniques, and achieved a higher frame rate of the sea background infrared real-time simulation. The 2D FFT technique was used to fast compute the geometric model data of sea, and the Geomipmap technology was introduced to optimize the organization of sea geometry model data. To accelerate the infrared radiation computing, the GPU was used. In order to improve the real-time rendering speed, pregenerated off-line data technique and view point based rendering technique were proposed. The result shows that the rendering speed of infrared sea created by the method can achieve 300 frame/s, meets the requirement of real-time simulation, and reserves more computing resource for other simulation parts of simulation system.