TakingBeijingasanexampleandbasedonthecensusdata,macro-levelpopulationstatisticaldataand2004~2013marriageregistrationdata,thispapermakesacontrastiveanalysisonthecharacteristicsandchangingtrendsoflocalresidents,migrantsandtemporarymigrants.Relativetothelocalresidents,themigrantsgenerallyhavehouseholdregistryofcentraldistrictsandhighereducationallevelandoccupationallayer.Temporarymigrantshaverelativelycomplicatedpopulationstructurebutdifferentiateduringtheprocessofmarriagematching.'Two-placemarriages'formastablegroupofnewpermanentmigrantsandmeanwhileimplyasizablegroupoflatentdependentmigrants.Thiswillproducegreatinfluencesonthegeneralpopulationstructureandtheagingprocess,whichmayalsoleadtosomeconflictsandproblems.Thegovernmentshouldbepreparedwithpolicyresponsessoastopromotethebenigndevelopmentofpopulationpersificationinmegalopolis.
