Both holographic interferometry and shearing interferometry are important methods in optical measurement but they are developed independently. Digital hologram can reconstruct wavefront numerically,and shearing interferometry essentially is the interference of a coherent wavefront with a copy of itself “sheared” or translated by a distance,so the principle of shearing interferometry can be applied to reconstruct the wavefront of digital hologram. By shearing numerical wavefront,several pixels to obtain few wrapped shearing phase will make the phase calculation easy. Based on theoretical analyses and the least-square principle,the algorithm of constructing wavefront is presented. Simulated and experimental results show the validity and feasibility of the presented algorithm. The obtained phase approaches experimental value well and is better than the results of conventional methods.