The boundary separating the mantle and the earth's crust,first detected in 1910 by Andrija Mohorovicic when she saw a sudden increase in the speed of earthquake waves beneath the thin crustal areas in Europe, is called the Moho border. In this study, the practical methods of estimating Moho depth using gravity data are reviewed, which can be combined with Bott, Cordell & Henderson, Parker-Oldenberg and Euler Deconvolutionin .Depending on how the case study is selected and the geographical conditions specific to each region using gravimetric data, one of these methods, which is more compatible with the conditions of the region, is used to study the thickness of the skin in studying the geological structures of different areas.