In　recent　years,　developing　novel　ideas　for　precast　foundations　has　become　an　important　issue　in　onshore　wind　turbine　foundations　to　improve　construction　efficiency　and　to　replace　the　conventional　in-situ　casting　process.　In　the　precast　wind　turbine　foundation,　precast　modules　are　assembled　together　and　maintain　the　structural　integrity　through　circumferential　prestressing　tendons　and　shear　key　tooth　joint,　where　the　performance　of　shear　keyed　joints　is　the　most　important　issues　studied　here　in　this　study.　Based　on　the　recent　study　and　systematic　analysis　of　the　shear　design　methods　available,　formulae　for　shear　keyed　dry　joints＇　shear　resistance　under　slip　failure　and　shear　failure　states　is　presented.　The　influence　of　shear　keyed　tooth　number,　presence　of　reinforcement　and　confining　stress　on　the　shear　capacity　of　the　joints　are　analyzed.　The　shear　capacity　is　in　proportion　to　the　initial　compressive　stress　at　the　joint,　small　confining　stress　results　in　slip　failure　while　large　one　slows　down　the　degree　of　shear　failure.　Finally,　the　behavior　checking　methods　based　on　slip　failure　mode　and　shear　failure　mode　are　verified　and　suggested.