Based on matrix optics , the principles behind the formation of the hidden region in the near-axislight of a lens system were investigated.The inluenee of different lens parameters on the optical hidden regionwas explored. Through orthogonal experimental design , numerical simulations using MATLAB and COMSOLwere conducted to compare and visualize the factors affecting the hidden region.The research revealed that thefoeal length and radius of the lens have an impaet on the hidden region. When the diameter of the lens remainsconstant,the sum of the volumes of hidden regions t, and t, is minimized when the lens has a focal length of fAs the foeal length of the lens deereases below f,it is found that the focal length and the extent of the hiddenregion are negatively correlated. Conversely, when the focal length exceeds f, there is a positive correlationbetween the focal length and the extent of the hidden region. When the focal length ofthe lens remainsconstant ,there is a positive correlation between the diameter of the lens and the extent of the hidden region.Theorder of influence of various lens parameters on the volume of the hidden region is as follows: focal length f'>diameter h, > diameter h,> focal length f.These research findings are of great significanee in gaining