In order to dynamically generate ground IR scene in simulation of IR seeker scene, a method for dynamically generating IR texture of ground was provided. First, the sample set was built based on data of total solar radiation in one hour, wind speed, air temperature, relative humidity and ground temperature made by measurement, and the engineering calculation model was built for ground surfaces with different materials based on this sample set. In the simulation engineering, based on texture of different material area, and according to the temperature field calculation model and mask texture made by multi-spectral imaging method, the ground IR texture was dynamically generated by shader. According to experiments, the predicted results of the temperature field model agree well with real measured date, and the IR texture of ground with good fidelity meets the demands of instantaneity in 3D engineering simulation.