As we know,understanding new phenomena such as the formation of neutron-rich and super heavy elements[1-4] without studying the fusion of heavy nuclei is impossible.Gaining information about the details of the interaction potential between two nuclei is difficult and time consuming.The total interaction potential is the sum of the long-range Coulomb repulsive force and short-range nuclear attractive force.Because we have no simple or accurate forms of the nuclear interaction potentials in comparison with the Coulomb part of the interaction potentials,many efforts have been made to introduce an appropriate form of the nuclear interaction potentials.[1-11] The result of this attempt presents a proximity potential that is very simple and applicable.By the proximity theorem,we obtain a simple formula for the ion-ion interaction potential as a function of the separation between the surfaces of two approaching nuclei.[5] Studying Ref.[6] shows that the original form of proximity potential 1977 overestimates the experimental data of the fusion barrier heights.In order to improve this model and to overcome the shortcomings,different types of proximity potential are proposed,and out of these,many modifications based on isospin effects either by surface energy coefficients or the nuclear radius are made over the original proximity potential 1977.