Because　the　wireless　sensor　network　has　some　merits　such　as　the　low　cost,　the　low　power　loss,　self-organizing,　distributional　and　so　on,　it　obtained　the　widespread　applications　in　the　industrial　production　and　the　daily　life.　The　localization　technology　has　been　the　popular　topic　in　the　wireless　sensor　network　area　researching.　This　article　proposed　one　kind　of　localization　method　based　on　the　improved　PSO　algorithm.　This　method　is　of　high　precision,　good　stability,　extensibility,　and　has　very　good　applied　prospects.