The activation effect of phosphate rock under hydrothermal condition and its effects on rape growth were studied. The results showed that the water-soluble P content, available P content and citric soluble rate of the activated phosphate rock under hydrothermal condition were all highly improved than that of phosphate rock. The hydrothermal activated phosphate rock improved bioavailability, which was beneficial to the rape growth significantly. The fertilizer use efficiency of hydrothermal activated phosphate rock by rape was markedly increased, which increased 60.94% than that of PR. All kinds of phosphate fertilizer application treatments increased the content of available P in soil. The soil available P which applied hydrothermal activated phosphate rock increased 0.3mg/kg compared with the treatment applied PR.