Abstract: A group of parameters which are proposed by using field observational data in the surface layer combined with second-order closure turbulence equations has been developed for a high-order turbulence model. Applying the parameters of this paper’s and Mellor’s which obtained from lab experiments to second-order closure equations respectively, the two groups of relative curves of ΦM(), ΦH () with have been maped out. The graphs show that the two groups of curves are almost overlapped and also fit the results of Businger’s field observational data very well. In the other two groups of relative curves of (w*)1/2 (), (θ*2) 1/2() with , the curves of this paper have far less deviation than that Mellor’s compared with the data of UTAH, but have a little greater error than that of Mellor’s compared with the data of KANSAS.