Abstract: With approximation the simplified barotropic and linearized equations are used to investigate the relationship between the topographical slope and the large scale low level cross equatorial current.The results indicate that if the large scale forcing field is expressed in terms of an analytical function consistent with the actualities, then after eliminating the dependent variables, the homogeneous part of the resulting is equation analogous with the Weber equation, thus the solution as well as the free term can be expanded by means of the Hermite function.The exact solution thus obtained is essentionally able to signify the characteristics of the strong wind belt and the flow pattern in the mean low level current, and the topographical slope has some relation with these characteristics, particularly with the wind speed.In addition, under a more general source distribution function and an arbitrary boundary condition, we obtain the numerical solutions of the non-homogeneous Weber equation for different topographical slopes, so as to study the relationship between the topographical slope and the mean wind field under these conditions.