In order to investigate the effects of nitrogen addition on soil inorganic phosphorus forms in alpine wetland in arid area sensitive to global climate change Field in situ experiments were arranged in the well protected Bayinbuluk alpine wetland Swamp (S), Swamp meadow (SM) and Meadow (M). According to the nitrogen deposition of Bayinbuluk grassland, the nitrogen application rates of 0 (CK), 8 (N1) and 16(N2) kg·N/(hm²·a) were set to study the effect of short~term nitrogen addition on soil inorganic phosphorus forms in alpine wetland. Results showed that:(1) The average total phosphorus content under alpine wetland soil was 1.09 g/kg, and total inorganic phosphorus was 492.71 mg/kg, and total inorganic phosphorus accounted for 45.67% of total phosphorus on average. (2) The soil inorganic phosphorus of the 3 wetland types mainly exists in the form of Ca-P, and Ca₁₀-P is the main form of Ca-P, accounting for 50.27%~64.69% of the inorganic phosphorus content. The contents of soil Al-P and Fe-P in S area were significantly higher than those in SM and M area, the contents of Ca₂-P, Ca₈-P and O-P in SM area were significantly higher than those in S and M area, and the content of soil Ca₁₀-P in M area was significantly higher than those in S and SM area. (3) Nitrogen addition significantly affected the content of various forms of inorganic phosphorus in alpine wetland soil. Compared with CK, the content of soil Al-P in S and SM areas increased significantly by 9.92%~17.35%, and the content of Ca₈-P decreased significantly by 3.18%~9.36%. The content of soil Fe-P in S and M areas decreased significantly by 3.18%~9.36%. The content of soil Ca₂-P in s area decreased significantly by 10.31%. It is worth noting that under the addition of nitrogen, the soil O-P content of the 3 wetland types increased significantly, which was 21.83%~25.94% higher than that of CK. (4) RDA showed that soil pH, organic carbon, available nitrogen and available potassium were important factors affecting the form of inorganic phosphorus. In conclusion, there are significant differences in the content of inorganic phosphorus forms in different wetland types. Nitrogen addition significantly changes the content of inorganic phosphorus forms in the soil, mainly by increasing the content of difficult to use inorganic phosphorus (O-P) in the soil, so as to reduce the phosphorus supply potential of alpine wetland soil. This study is helpful to predict the changes of soil inorganic phosphorus in alpine wetlands under the background of continuous increase of nitrogen deposition.