Abstract: n this paper used the finite-analytic method to solve the threedlmenslonal eletrohydrodynamlcal equations. The results show that Polezhaev’s simplified numerical model Is not correct when there exist reverse flow zones under the normal gravity environment.In order to tackle the shortcoming of Polezhaev’s model,a new slmplified numerical model is Proposed in the Paper,which can be used under both microgravity and normal gravity environments. The numerical results are favorable compared with the results obtained from three dimensional model.