ThispaperproposesthediscriminantanalysisonlandgradingafteranalyzingthecommonmethodsanddiscussingtheFisher'sdiscriminantindetail.Actuallythismethoddeducesthedimensionfrommultitosingle,thusitmakesthefeaturevectorsinn-dimensionchangetoascalar,andusethisscalartoclassifysamples.Thispaperillustratestheresultbygivinganexampleoftheresidentiallandgradingbythediscriminantanalysis.