Optical imaging system is limited by pixel resolution and diffraction limit,but the researchers try to solve this problem.Various super-resolution imaging methods and techniques in recent years are introduced,including STED technology,SIM technology,PALM technology and STORM technology for the fluorescence microscopy imaging;pupil filtering technology and radially polarized super-resolution focusing technology for microscope,optical storage and retina imaging;synthetic aperture technology,photon sieve imaging technology,super oscillation lens technology,sub-pixel technology and focal plane coding technology for space detection area.The principle,the implementation means and the current development level of these super-resolution imaging methods were discussed.