This　paper　proposes　a　zero-forcing　beamforming　design　for　the　energy　efficiency　optimization　of　the　magnetic　resonance　based　wireless　power　transfer　system　with　multiple　transmitter　coils,　which　aims　to　secure　energy　transfer　control.　A　scheme　based　on　beamforming　technology　is　proposed　to　prevent　unauthorized　users　from　accessing　the　system,　which　builds　a　beamforming　model　consisting　of　multiple　transmitter　coils,　a　target　receiver,　and　a　non-target　receiver　to　simulate　the　actual　system.　Then　to　optimize　the　proposed　system’s　energy　efficiency　while　constraining　the　target　receiver’s　energy,　spectral　efficiency,　and　transmitter’s　power,　the　proposed　beamforming　model　is　constructed　as　an　optimization　problem.　To　solve　this　non-convex　nonlinear　fractional　programming　problem,　the　Dinkelbach　algorithm　is　used　for　fractional　conversion,　and　then　the　zero-forcing　constraints　are　equivalently　replaced.　Finally,　two　solutions　of　the　nonlinear　solution　and　closed-form　solution　are　derived.　The　simulation　results　show　that　the　energy　efficiency　optimization　strategies　of　zero-forcing　beamforming　with　the　two　derived　solutions　can　satisfy　the　design　requirements.　©　2021,　Electromagnetics　Academy.　All　rights　reserved.