Abstract: Methods for solving input impedances of dipole are analyzed, including Poynting vector method, the equivalent transmission line method and induction electromotive force method commonly used in engineering, Hallen integral method and method of moment(MoM), mutual impedances between unequal heights dipole are computed. Focusing on study of equivalent transmission line method and Hallen integral method, the shortcomings of equivalent transmission line method are revised, and the parameters of input impedances calculation using Hallen integral method are deduced. Compared the results obtained from this revised formula with that from Hallen integral method and MoM, the results show the revised formula is the same with general dipole.