Flood forecasting in any area with no data or insuicient data is a problem and challenge. In this paper, on the basis of screen ofhydrologie forecast models which are suitable for the whole province, the runoff yield and flow concentration paramelers of978 storm floods in 39representative basins in Zhejiang Province were calibrated using automatic optimization technology one by one.According to the parameter rangeand sensitivity，methods as average and contour spatial inierpolation,regression analysis using projection pursuit combined with thecharacteristics of river basins were used to realize regional comprehensive of the runoff yield and flow concentration paramelers. The floodforecasting methods for the ungauged areas in the whole province have been proposed and examined by prediction models, and the precision canmeet the requirements of flood warning.