The study on characters of phosphorus supply and response to phosphatic fertilizer showed that inorganic p and organic P accounted for 91.12% and 8.87% respectively. In the former Ca-P,O-P, Al-P and Fe-P accounted for 86.1%,9.6%, 3.0% and 1.3% respectively. The relation between inorganic-P forms and rapidly available phosphorus (RAP) could be described by y(RAP)=49.30x_1(AL-P)+21.8547x_4(Ca-P)-3.4209, which indicated the significance of Al-P and Ca-P to RAP and the feasibility that iron and aluminum phosphates and calcium phosphates served as soures to soil P. The growth and decline of total P and available P deponded on P balance in soils. The changes of P forms in fertilizers aapplied relied on soil properties. The great effect of fertilizer P occurred at the early growth stage of plants. At the middle and late stages, plant took up more soil P. P-fertilizer efficiency in coarse and fine sand soils was 41.1% and 17.7% respectively, higher, than that in light sand soil.