The basic principles of wavefront sensing based on phase diversity(PD)are expatiated.According to the effect of image edge effect on PD technology,the reason is analyzed and the fuzzy processing of image edge is proposed by using window function.And the merit function converges to the global optimum.The simulation results show that using window function to degraded image and then calculating the wavefront,the precision of PD technology is greatly improved to about λ/100(RMS).And the results of outfield imaging experiment show that after window function pre-processing,the quality of restored images have a certain degraded of improvement.