Abstract: In order to stress the relationship between the climatic conditions and the yield,the authors carried out the resolution of space field in average yearly yield of soybean of three provinces in northeast by means of Chebyshev polynomial;after filtering some effects of non-climatic factors,and taking the simulated value of binomial as the climatic yield,analyzed the relationship between the climatic yield and climatic factors.The mathematical model of the relationship between the annual soybean yield in various areas in northeast and the accumulated temperature (∑T≥10℃)in growing seasons,Zhang Baokun’s dry index (K=0.16T/R),mean monthly temperature in July and August.On the basis of this model,the climatic productivity target(A_i=Yi/Ymax)was calculated,and the distributed features in space were analyzed. That provides a basis for rational distribution of soybean.