5、complex,isbasedonthedensityofasolution,throughtheneighborhoodofthejudgmenttodistinguishbetweentheabnormalpoints,theresultismoreaccurate. UsingARMAmodeltodealwiththedata,judgewhetherthedataisflatcanbeappliedtothechoiceofthemodel,thenidentifytheoutliers.KeyWords:Abnormal point, timeseries, ARMAmodel,