Based　on　the　quantum　Zeno　dynamics,　a　scheme　is　presented　to　implement　a　Toffoli　gate　of　three　separated　superconducting　qubits　(SQs)　by　one　step.　Three　separated　SQs　are　connected　by　two　resonators.　The　scheme　is　insensitive　to　the　resonator　decay　because　the　Zeno　subspace　does　not　include　the　state　of　the　resonators　being　excited.　Numerical　simulations　indicate　that　the　scheme　is　robust　to　the　fluctuation　of　the　parameters　and　the　Toffoli　gate　can　be　implemented　with　high　fidelity.