The ray-tracing channel modeling based on the principle of geometrical optics can accurately predict multipath information, such as strength, time delay and angle of arrival and so on. The 3D models of experimental scenes are mostly segmented as polygons or triangles in this method. In order to improve the path searching efficiency of ray tracing in channel modeling, we propose an improved ray-triangle path searching algorithm. By adding the eliminating operations, the judging process is simplified, and the amount of computation is reduced. Taking three different types of scene model as example, algorithm comparison before and after the improvement is done by simulations. The results show that the improved path searching algorithm is faster than the original one. The more complex the scene model is, the higher the efficiency is.