[Objective] The accumulation and release of inorganic phosphorus in vegetable field soil under the condition of greenhouse cultivation was explored, in order to provide basis for the rational application of phosphorus fertilizer and the sustainable development of protected agriculture. [Methods] The greenhouse soil in Tieling County (2—28 years) and Haicheng City (2—33 years) of Liaoning Province with different planting years was collected. The change of total phosphorus, available phosphorus and inorganic phosphorus in soil and the curve of phosphorus release were taken as the breakthrough point, to analyze the variation of soil phosphorus with different planting years. [Results] ① The total phosphorus, inorganic phosphorus and available phosphorus in topsoil in both of Tieling County and Haicheng City protected vegetation fileds increased first and then decreased with the increase of planting years, and reached the peak at about 20 years after planting, with the highest contents of total phosphorus content reached 5.76±0.61 g/kg and 7.08±0.72 g/kg, respectively. ② Ca₈-P was the main content of inorganic phosphorus in surface greenhouse soil, and the highest content was 34.2% and 59.9% of the total inorganic phosphorus, followed by Fe-P and Al-P. Ca₈-P increased with the increase of planting years, while Fe-P decreased with the increase of planting years. ③ The release rate of phosphorus was relatively high in the early planting period (about 2—15 years), and the correlation between the release amount and Ca₂-P and Fe-P reached a significant level. [Conclusion] The main form of phosphorus accumulation in surface greenhouse soil was Ca₈-P, and Ca₂-P and Fe-P, were the main forms of phosphorus leaching.