Abstract: By fitting to surface wind velocity at 5—146 m tower height, divided into six layers for three years in Wuhan, several methods for obtaining shape and scale parameters of the distribution function are analyzed with two-parameter Weibull distribution function. In comparison with the observational data, it is shown that the empirical method is better than the least square method. Using the empirical method to estimate the wind energy of surface layer, the maximum relative erros is 2.7% and the minimum one is only 0.1% in comparison with the conventional method. At last, the vertical distribution law of wind energy is discussed.