Abstract: The optical design software ZEMAX is used to simulate the imaging of a point source for Wolter microscope. Considering the imaging of geometrical optics only, three instances are considered, including the two surfaces coaxial and cofocal, non-coaxial, and coaxial but not confocal. The imaging of a point source is discussed respectively. The depth of focus and the depth of field are given. The imaging of a point source in different fields is also analyzed. It is concluded that Wolter microscope is very strict with the object distance and image distance. The influence of the two surfaces' non-coaxiality and non-confocality is much great on imaging. These results provides basis for imaging analysis of Wolter microscope.