Impact of Spring Climate Change on Wheat Yield in Lower Haihe Plain

Based on the data of climate and wheat yield in Lower Haihe Plain,the climate change and it's impact on wheat yields are studied.The results show as follows: Spring temperature has significant linear increasing trend with 0.38 ℃ per 10 a during the recent 56 a;spring precipitation has no obvious linear increasing or decreasing trend;since 2000,the climate is not conducive to winter wheat production;climate yield of winter wheat has a good correlation with spring temperature and precipitation;when the temperature anomaly is among 0.2—1.2 ℃,the climate yield is positive;the climate yield will be negative with too high or too low temperature,high temperature reduces wheat production more;the winter wheat production has been continuingly lower due to the higher temperature these years.The need of winter wheat growth for spring precipitation has a limit,both too much and too little precipitation cause reduction of wheat output.Changing planting pattern,improving agricultural microclimate,and carrying through weather modification to increase effective precipitation in the ground can increase winter wheat yield.