Abstract: New Reynolds mean momentum equations including both turbulent viscosity and dispersion are used to analyze the balance motion of the planetary boundary layer.It is pointed out that the turbulent dispersion with γ0 will;increase the depth of Ekman layer and reduce the wind velocity in the Ekman layer and obtain a more satisfatory Ekman spiral fit to observed wind hodograph.The wind profile of surface layer including turbulent,dispersion is still logrithmatic,but the von Karman's constant k is replaced by k1=k√1-k/2,so the wind speed increase a little rapider with height.