By taking urbanizaton level of Anhui Province during 1990-2011 as sample interval,based on such three single forecasts as exponential smoothing,grey forecast and regression forecast,by taking minimum forcast reciprocal error square sum as standard,this paper sets up IOWHA Operator Combination Model, and the evaluation results of forecast effectiveness by this Model show that this combination Model can effectively improve forecast accuracy.Based on this combination Model,this paper forecasts that the urbanization level of Anhui Province during 2012-2015 will reach 46.35 percent,47.89 percent,49.44 percent and 50.98percent respectively.