The imaging technology in modern microscope for widefield microscope, confocal microscope and super-resolution microscope is outlined here. The most frequently-used technology in the widefield microscope is brightfield, darkfield, phase contrast, polarization, DIC, modulation contrast and fluorescence. In phase contrast, there is also apodized phase contrast. In addition, DIC, C-DIC and PlasDIC are also presented. Confocal microscope is developed greatly with the development of computer and manufacture technology. Besides conventional confocal system, the principle of coherent anti-Stokes Raman scattering(CARS) confocal,multi-photo confocal, white confocal are also explained in detail. As for super-resolution microscope, the principle of stimulated emission depletion(STED) and ground state depletion microscopy followed by individual molecule return(GSDIM) are clarified.