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Abstract: In this paper, first of all, the initial value yG~0 of maximum yield is determined on the assumption that the yG~0 equals to the spline interpolation function which is obtained by considering the yield of better harvest years as interpolation nodes and the initial values c_i of influencing indexes of harmful climatic conditions are given by means of solving a series of linear equations. Then, the maximum yield YG under optimum climatic conditions and influencing indexes c_i of unfavorabal climatic conditions x_i are evaluated by repeatly using iteration approximation. In the final, one new kind of model of yield prediction is given, as follow■=y_G(1-sum from i=1 to ∞ c_iX_i)

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