Abstarct: In this research, the methods of preparing high-quality seismic section using single square root (SSR) and double square root (DSR) of time process, and selecting the appropriate intervals to amplify reflection waves and diffraction waves were considered. In these methods, small and large interval of the midpoint was used to reinforce reflections and diffractions. The Common Reflection Surface (CRS) is a method independent of speed and automation model which has been used in processing seismic data since the past decade, the progressions of this method play an important role in solving seismic data imaging problems. This method provided seismic images with a high signal- to- noise, more association between reflectors, increased side clarity and high quality. The quality of stacking outcomes, such as event continuity and noise reduction, is not only influenced by the choice of the time process, but rather depends on the choice of an appropriate range for stacking. SSR (single square root) operator and DSR (double square root) operator were used as a specific time process of stacking in different intervals baxsed on Project Frensel Zone (PFZ). In this study, DSR equation is obtained by SSR equation to compare the output sections in terms of quality (reflection/diffraction) by helping these two methods and applying them on the data. In this research, both SSR and DSR stacking methods with a small and large midpoint interval was applied on real and unreal data. The sections obtained from these were compared to small and large midpoint interval in unreal data by means of section difference. The results of these two methods showed that the SSR with a small midpoint was effective in amplifying the reflection waves and partially undermine the diffraction waves. On the other hand, in order to projecting the geological structures with more details, using diffraction waves was taken into account, during which DSR operator that amplify diffraction waves was used. DSR with the large midpoint interval had the best performance in amplifying the diffraction waves and had been able to undermine refection waves. The method had the capability of presenting a more detailed image of producer structures of diffractions, especially the complex geological structures. In the following, the results of these two stacking method were compared on field data, for better comparison, they were done on Kirchhoff ‘method. The results of Kirchhoff’migration indicated that DSR with large midpoint interval showed fractions and faults better due to the amplifying diffraction waves, and showed an image with more details and better quality.