In order to overcome the wave-front distortion caused by atmosphere turbulence and optical system aberration, the Phase-Diverse Speckle (PDS) method was used to collect simultaneouslly two or more short-exposure optical images formed by focusing or defocusing to estimate both the object and the wave-front phase.To verify the improvement of image resolution and phase estimation of PDS method,A comparison experiment on high-resolution imaging and phase estimation comparison was carried out based the PPS method and a Shack-Hartmann sensor. By shifting the high accurate translation stage at a certain distance,the focusing and defocusing images were obtained,then the wavefront phase based on the image was camparied with that from the Shack-Hartmann sensor. Experiment results indicate that the estimated wave-front phase is highly according with that detected by Shack-Hartmann and the resolution of the restored image can increase by 12% compared with the origin image formed by focus plane. In conclustion, the proposed method can be used to restore the degradative images in large aperture telescopes.