Potexperiment was carried out for studying interaction between P and Zn of soil and their nutrition of corn seedlings,grown on Calcareous Cinnamon Soil of Shanxi,which was loamy in texture with a pH of 8.12,available P of 2.56 ppm and available Zn of 1.08 ppm.At the same time,mathematic modelling was used in order to quantitively study the interaction of P and Zn in Calcareous Soil and their mutual effects on corn growth.The main results obtained are summarized as follows:(1) When the supplies of available P and Zn in soil were harmony,the uptake of F and Zn by corn seedlings were accelerated each other and the interaction between P and Zn was significant and vice versa.(2) The P application could accelerat the desorption of zinc and increased the content of available soil Zn.(3) The precipitation of Zn₃(PO₁)₃ in soil wasn't the main cause of Zn and P deficiences.The mutual restraint of P and Zn in corn nutrition was a kind of physiological obstruction within roots.which was caused by imblance of nutrition.