In the water environment, phosphorus exists in granular and dissolved forms. If it exceeds a certain limit, it will lead to the rapid proliferation of algae and plankton in the water, cause eutrophication, reduce dissolved oxygen in the water, and lead to deterioration of water quality. How to effectively control and prevent the eutrophication process of water body is still an important topic for the remediation of water environment pollution. The first step is to detect the phosphorus content. Ion chromatography has the advantage of fast and convenient detection of phosphate.