In　order　to　simplify　the　calculation　of　structural　system　reliability,　the　dependence　of　RC　Non-coupled　shear　walls　were　studied　by　using　Monte-Carlo　method　under　minor　earthquakes　in　this　article.　The　study　results　indicate　that　the　failures　of　different　storeys　of　RC　holistic　shear　walls　are　neither　absolutely　independent　nor　absolutely　dependent.　The　failures　of　the　lower　storeys　(approximately　accounting　for　half　of　the　total　storeys)　are　independent.　The　failures　of　the　top　storeys　(approximately　accounting　for　half　of　the　total　storeys)　are　dependent.