A　method　of　designing　left-handed　metamaterials　based　on　inter-unit-cell　coupling　was　proposed　in　this　paper.　A　theoretical　model　was　established　using　equivalent　circuit　theory　By　properly　setting　the　geometrical　parameters　of　adjacent　unit　cells,　the　electric　resonance　frequency　can　be　made　equal　to　the　magnetic　resonance　frequency.　Thus,　the　left-handed　bandwidth　reaches　its　maximum　A　typical　left-handed　metamaterial　based　on　inter-unit-cell　coupling　was　fabricated　and　tested.　The　experimental　results　show　that　the　test　sample　has　equal　electric　and　magnetic　resonance　frequencies　and　the　left-handed　bandwidth　is　24　GHz.　This　verifies　the　design　method　proposed　in　this　paper