The imaging resolution of all ground-based telescopes is severely limited by the effects of atmospheric turbulence,especially for imaging the extended objects. The lucky imaging technique is an image post-processing method based on selecting-recentring-coadding of sequence short-exposure images of objects,which can reduce the influence of image quality because of turbulence-induced imaging motion-blur restoration and reduce the resolution loss. The basic theory and flow of lucky imaging are introduced,and then this technique is used on the data of experimental observation of extended objects through atmospheric turbulence. The results show that the lucky imaging technique can improve the imaging resolution of extended objects through atmospheric turbulence.