Abstract:Computer simulation is applied to study the diffraction problem of binary lenses with various numerical apertures based on Fresnel diffraction formula and Reileigh-Sommerfeld formula respectvely. The computing results demonstrate the apllied range of Fresndl diffraction theory and Reileigh-Sommerfeld theory themselves.The problem about application of vector electomagnetic theory is discussed as well on design of high numerical binary aperture binary lenses.