The random field models can be available in synthesizing the natural texture according to the statistical distribution of intensity of texture in space. With Markov property of the temperature fields distribution on the surface of objects, the Generalized Long Correlation(GLC)random fields model is applied to simulate the distribution of temperature fields on the surface of natural terrains. And the radiation fields of terrain can be easily calculated by Planck′s radiation law. The infrared textures can be produced after digitalization of radiation fields by given display ruler and quality of radiation. The simulation results show that the GLC model can generate the infrared texture in bands of 3 ～5μm and 8～12μm effectively.