A method for generating infrared images in battlefield environments based on JRM was developed to satisfy the performance requirements of a new generation of infrared-imaging target simulation systems and generate realistic infrared images of battlefield environments for infrared-imaging-guided weapons to conduct hardware-in-the-loop simulation tests. First, a three-dimensional model of the target was established using 3DSMAX. The satellite image data and elevation data of the target area were combined to establish a three-dimensional model of the background area to satisfy the requirements of the seeker’s field of view. Next, JRM’s Genesismc, Sigsim, and Sensim tools were used to model the physical material characteristics, target heat source, environmental characteristics, and sensor characteristics. Finally, the OSV tool was used to render the infrared image in real time. The experimental results show that the method satisfies the requirements of real-time generation of infrared images in an infrared-imaging target simulation system and has the advantages of strong flexibility and good effectiveness.