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Inspired by strong mechanical stability of "Y"-shaped beams for building construcrion,we design a new class of quasione-dimensional graphene nanostructures,namely,tri-wing graphene (TWG) nanoribbons.TWG possesses significantly augmented mechanical stability against torsional and compression forces,and also each wing of the TWG can retain independent electronic properties of the constituent graphene nanoribbons.As such,by tailoring the wing structures.the TWGs can provide broader property tunability for nanoeiectronic application.In addition,zigzag-edged TWG is a metallic ferromagner with a large magnetic moment.When its edges are decorated with suitable chemical functional groups,a TWG can be converted to a half metal for potential spintronic applications.