With　the　development　of　computer　network　technology,　more　closely　the　relationship　between　people　and　network.The　current　network　security　problem　has　also　been　gradually　into　the　public＇s　field　of　vision,　actively　carried　out　on　the　network　intrusion　detection　becomes　an　important　direction　of　the　development　of　the　network　security　technology.On　the　basis　of　the　original　BP　neural　network,　this　paper　puts　forward　an　improved　algorithm,　and　applied　to　network　intrusion　detection.　After　the　test,　the　method　is　better　than　traditional　convergence,　better　performance.　©　2016　SERSC.