The light could be split into lots of beams with Digital Micromirror (DMD), and focused by convex lens. Then,a point light source array will be formed, in which the size of point and the space between points can be controlled conveniently. The DMD is more flexible and cheaper than the traditional micro optic elements. With a digital parallel light source constructed with DMD used in parallel confocal microscopy detecting, an optical path is designed for current measurement environment. The experiment result indicates that the axial resolution could be improved with smaller period of point light source array, and the conclusion is based on the pixels of array meeting the needs of DMD and CCD.