Abstract: This article introduces an aperture performance test instrument testing the scope of application for the ambient light illumination of the television system in the laboratory condition.It consists of the composition and working principles of this system,the major technological difficult points with their solutions,and the technology quota this apparatus has reached.This apparatus is compactly structured and light in weight and the performance of which is stable and reliable realizes high resolving power of the optical coupling system and wide adjusting scope of the image illumination and high precision.