The stray light affecting photometric measurement was analyzed by using geometrical optics analysis method. According to the characteristics of stray light reflection transmission, a concave narrow aperture array model with high refraction and reflection effect was designed by combining the approximate absolute blackbody structure theory and absorbance summation theory, so as to improve the ability of stray light suppression. Due to the different extinction effect of this structure under different aperture spacing, an adaptive inertial weight particle swarm optimization algorithm was designed to search for the optimal aperture spacing, so as to further improve the performance of the aperture array. On the basis of the above, the distributed photometric system based on the optimal suppression model was verified by simulation and experiment. The results show that measurement error of system from more than 10% to less than 1% compared with before. The system satisfies the corresponding international and national standards for the error requirements of light source measurement. It can be used as an effective means to further suppress environmental stray light in the existing environment.