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本文探讨了农业科研和生产中二维变量函数曲线的最佳似合方法—最小Ｓ值法，即最小离回归标准差法。并应用这一方法先后在ＦＡＣＯＭ－３４０Ｓ中型机上用汉化ＦＯＲＴＲＡＮ和在ＩＢＭ兼容微机上用汉化ＢＡＳＩＣ作成了一个简单适用的二维变量函数曲线的最佳拟合及图形处理系统。经过一段时间的使用说明，此系统所拟合的各种常用曲线方程、优选的最佳拟合曲线方程以及绘制的拟合曲线图都比传统的手工方法简单、方便、准确。这一实现，对指导农业科研和生产的有关理论和实践都具有一定的实用价值。
This paper discusses the best fit method of two-dimensional variable function curve in agricultural research and production-the minimum S-value method, that is, the minimum deviance return standard deviation method. And this method has been used in the FACOM-340S mid-sized machine with Chinese FORTRAN and IBM-compatible microcomputer with the finished BASIC made a simple two-dimensional function curve fitting best fit and graphics processing system. After a period of use instructions, the system fit the various commonly used curve equation, the best curve of the best fit curve and draw the curve of the curve than the traditional manual method is simple, convenient and accurate. This realization has certain practical value for guiding the relevant theories and practices in agricultural research and production.