The parameters of fertilization according to soil analysis were studied by many field experiments in different soil and climatic area of Siping and Liao yuan for five yrars.The main parameters include:production of one hundred Kilograms corn grain require how many nitrogen, phosphrous and potassium;the coefficient of nitrogen and phosphrous provided by soil;the efficiency of nitrogen and phosphrous fertilizers;etc, This study analysis comprehensiuely for variability, regularity and suitability of main parameters by terting large amount of soil and plant samples.We obtained a number of linear equations and cubic equations of factors relate to the available nutrient and soil fertility, Thus the quantity and suitability of fertilizer may be determined by the parameters, It nearly equal to the best fertilizer quantity determined by the equations, The parameters have been using in production and obtained remarkable economic profit。