Single-atom　catalysts　(SACs)　maximize　the　utility　efficiency　of　metal　atoms　and　offer　great　potential　for　hydrogen　evolution　reaction　(HER).　Bimetal　atom　catalysts　are　an　appealing　strategy　in　virtue　of　the　synergistic　interaction　of　neighboring　metal　atoms,　which　can　further　improve　the　intrinsic　HER　activity　beyond　SACs.　However,　the　rational　design　of　these　systems　remains　conceptually　challenging　and　requires　in-depth　research　both　experimentally　and　theoretically.　Here,　we　develop　a　dual-atom　catalyst　(DAC)　consisting　of　O-coordinated　W-Mo　heterodimer　embedded　in　N-doped　graphene　(WiMoi-NG),　which　is　synthesized　by　controllable　self-assembly　and　nitridation　processes.　In　W1Mo1-NG,　the　O-bridged　W-Mo　atoms　are　anchored　in　NG　vacancies　through　oxygen　atoms　with　W-O-Mo-O-C　configuration,　resulting　in　stable　and　finely　distribution.　The　W1Mo1-NG　DAC　enables　Pt-like　activity　and　ultrahigh　stability　for　HER　in　pH-universal　electrolyte.　The　electron　delocalization　of　W-O-Mo-O-C　configuration　provides　optimal　adsorption　strength　of　H　and　boosts　the　HER　kinetics,　thereby　notably　promoting　the　intrinsic　activity.