Abstract: Through the plot experimental study, the corn output and the chemical fertilizer use factor in different applies fertilizer technical condition remains after deduction in the difference. Its optimized order is： NPK organic fat 〉NPK〉NP〉NK〉N〉PK＋ck;Deeply executes NPK organically is fat 〉deeply executes the NPK〉convention executes NPK〉weeds out the earth shallowly executes NPK 〉scatter NPK 〉ck.Established the goal output,the blank field output and the soil nutrient according to the nutrient zero-method measures the definite value and corresponding N,P,the K chemical fertilizer executed theamount used the functional relation, in pre-natal proposed N,P,the K chemical fertilizer was suitable the amount used and the proportion as well as corresponding applies fertilizer the technology.