The major methods of wave-front reconstruction are fringe tracing and phase-shifting. The defaults exist in the two methods. The fringe tracing method acquires the prior distribution characteristics of the field to reconstruct the whole wave-front. The phase shifting method needs more than three interferograms on the same view angle. In this paper, a phase unwrapping method is applied to reconstruct the wave-front basing on one interferogram. The method used in coherence measurement is based on Furrier transform. The reconstruction result is compared to the result acquired with the fringe tracing method.