Toimprovethecomparabilityoftheresearchresultsofecologicalindustry,theecologicalfootprintisappliedtoanalyzetheresourceutilizationandenvironmentalpollutioninvarioussubsystems,takingmaize-MSGasacase.ResultsshowthattheproductionprocessfrommaizetoMSGisaextendedprocessofecologicalfootprint,andthattheecologicalfootprintofthemaizeproductionisthebiggest;theextensionofecologicalfootprintisfollowedbytheincreaseoffootprintprofit,whichmeansthattheextensionofproductionchainisanimportantmethodtoimprovetheresourcesprofit;thesystemshaveabigproportionoftheindirectenergyecologicalfootprint;theairandwaterpollutioninMSGsubsystemisthemostserious.Atlast,itcanbeidentifiedthatecologicalfootprintisagoodmethodtomeasureresourceutilizationandenvironmentalpollutioninvarioussubsystemsofanintegratedecologicalindustry.
