Abstract: The virtual thermal test platform is developed to predict the results of a real thermal test, and therefore it can be used to design the real thermal test. The modeling method, the object combination strategy, and the data storage scheme of the modeling tool module for the virtual thermal test platform are analyzed. The model data are stored in the datasheet and queried by using a modified preordered tree traversal algorithm. This algorithm is more efficient, as compared to the adjacency?list?model. Finally, a method of modeling the infrared cage based on the modeling tool module is presented.