To find out the effect of different alkaline conditions on inorganic phosphorus components of soda saline soil, this research selected the soda meadow alkaline soil in western Jilin province as the research object, and used the method of indoor simulation experiment combined with indoor analysis to study the dynamic changes of the components of inorganic phosphorus content in soil of different forms under different alkaline conditions. The results showed that reducing alkali soil pH value within a certain range was helpful to increase the contents of Ca2-P, Fe-P, Al-P, and Ca8-P, which increased by 44.8%, 4.1%, 45.9%, and 42.0% in pH 8.3 treatment compare with those in the pH 9.2 treatment, and increased by 44.8%, 4.1%, 45.9%, and 42.0% compare with those in the pH 10.2 treatment; the effect of pH on O-P content was relatively small, and pH change in short term would not affect its content; Ca10-P content in soil increased with the increasing soil pH value, which increased by 15.6% and 51.4% respectively in the pH 10.2 treatment compare with those in pH 9.2 and pH 8.3 treatments. The research showed that different alkaline conditions could affect the conversion between the different inorganic phosphorus, and the decrease of soil pH value was good at the increase of the content of valuable phosphorus, but led to the decrease of the content of potential phosphorus in soil.