Abstract: Optical engine is one of the key components to affect the qualities of the chroma and luminosity in LCD projectors. Based on the structure characteristics of the optical engine and the principle of chromatometry, the chroma and luminosity simulation analysis software for optical engine design is developed by tracing the light beam. The software can be used to analyze and count the chroma and luminosity qualities of the optical engine. It also can be used to optimize the structure of the optical engine based on the chroma and luminosity index. Some experiments were carried out to compare the simulative engines and actual optical engines, and results were provided. An optical engine was optimized with the software, and the optimal data for the engine structure were acquired. The experiment result shows that the software can improve the design efficiency of optical engines.