The developing technology of imaging detection needs more higher resolution of optical systems. According to the traditional optical theory, the aperture should be enlarged to fit the reqllirement. Bait it is difficult to achieve this method in such a system with limltod scale, weight and Price. A pupil super-resolution technique based on the Rayleigh Criterion as a PIV index is studied and presented in this paper. This method can improve the system resolution without the enlargment of aperture of optical system. There super-resolution pupils have been designed based on the theory analysis, and the results of computer simulations are also presented here.