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The generation and control of the valley-polarized current play the key roles in valleytronics applications,but still remain as tough challenges [1,2].We propose a general idea of switchable valley injection,and predict theoretically that a ferromagnet-covered graphene junction would take the form of a valley-injector [3].The ferromagnetic layer can break both the spatial inversion symmetry(SIS)and the time reversal symmetry(TRS)in graphene.