TheeasternandwesternfrontsofplatemovementinTaiwanIslandandTibetanPlateaurespectivelyarethetwomajorsourcesoftectonicforceforthemorphogensisduringQuaternaryinChina'stropics.SevenexamplesofgeomorphologicaleffectsofplatemovementareenumeratedtodiscussthedifferentiationoftectoniclandformsinspaceandtimeduringQuaternary.ThetectonicmovementtendstobemoreactivesincemiddlePleistocene.Somephenomenasuchasthearc-shapemountainsystems,volcanismandcrustaldeformationimplythatthejuncturezoneofeasternandwesterntectonicforcesislocatedatabout110°E.