The occurence of winter wheat gibberellin mainly depends on the weather condition. The general circulation factors at 500hPa are the physical quantities that represent weather course of large area and the influntial weather conditions as well. Some factors of general circulation at 500hPa correlated with winter wheat gibberellin in significance and stability,were found out by optimum analysis for different regions in Jiangsu province. Finally the long range prediction models for influnce extent of winter wheat gibberellin were developed based on these factors.