An indoor simulating experiment was conducted with repacked soil columns to study the effect of the combined application of organic and inorganic fertilizers on phosphorus leaching in vegetable soils. Results showed that increasing organic fertilizer application obviously increased the content of soil organic P, thus caused phosphorus leaching. At the same applied amount of phosphate fertilizer, the more proportion of organic phosphate fertilizer, the higher concentration and accumulative leaching amount of TP, DTP and DOP in soil columns leacheate. The results suggested that soil organic P could be used as an index to evaluate the effect of soil-phosphorus-loss risk in water environment.