The soybean, "Tiefeng 18", has been the best variety of soybean in our country for more ten years. It is of wide adaptability, better function of commodity and more economic efficiency. For years, the scientific research institutions of the different parts in our country have tried to grow it under the various geographical conditions. The authors, according to the test informations achieved have done a lot of calculations, using statistic analysis method. After studing the law that environmental Condition,geographical latitude and height above sea level have an effect on soybean, "Tiefeng 18", the authors present yield models under the different geographical conditions. In this paper, the authors offer the various scientific informations so as to grow it on large area in all over the country.