The analytic solution of the multiple scattering m - nth moment equation with different wave numbers and different posiiions is given in the small angle scattering approximation for optical wave propagated through such a random medium, that the material parameter fluctuates inhomogeneoursly in the dirction of propagation and homogeneously in the direction transverse to the propagation path. The applications of the solution to the problems related with the optical beam propagation are discussed.