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We systematically studied surface plasmons reflection by graphene wrinkles with different heights on SiC substrate.Combined with numerical simulation,we found that the geometry corrugation of a few nanometer height wrinkle alone does not causes a reflection of graphene plasmons.Instead,the separated wrinkle from substrate exhibits a nonlinear spatial Fermi energy distribution along the wrinkle,which acts as a heterojunction.Therefor a higher graphene wrinkle induces a stronger damped region when propagating graphene surface plasmons encounter the wrinkle and get reflected.