1. An image-guide microsurgery system comprising: a three-dimensional microscopic imaging device comprising: a) a lens system having an objective lens, and a variable focal length micromirror array lens (MMAL) optically coupled to the objective lens, wherein the variable focal length MMAL comprises a plurality of micromirrors, wherein each micromirror is independently controlled to change focal length of the variable focal length MMAL and compensates aberration of the three-dimensional microscopic imaging device; b) an imaging unit, optically coupled to the lens system, configured to receive the focused object image from the lens system and to sense the focused object image; and c) an image processing unit, communicatively coupled to the imaging unit, configured to process the object image sensed by the imaging unit and to generate all-in-focus image with depth information; and a three-dimensional display device, wherein three-dimensional display forms three-dimensional images by using all-in-focus image with depth information.