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Wind power calculation is a key work in wind farm construction. At present, most company use WASP to evaluate the wind power. WASP is designed on the basis of European landform. In china, the landform is so complex that it is need to take a new calculation way to get a more practical result. Here Weibull density function is regarded as wind frequency distribution and a simple generation calculation formula is deducted. Based on Chinese complex landform, a constraint condition is added to the calculation expression and a new feasible calculation model is given. VC++ and Matlab are used to implement this calculation model. At last, Nordex N80 and N90 are took as an example to evaluate the wind power of an island. The result shows that the performance is better than WASP.