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In this work,we designed and studied a feasible dual-layer binary metagrating,which can realize controllable asymmetric transmission and beam splitting with nearly perfect performance.Owing to ingenious geometry configuration,only one meta-atom is required to design for the metagrating system.By simply controlling air gap between dual-layer metagratings,high-efficiency beam splitting can be well switched from asymmetric transmission to symmetric transmission.The working principle lies on gap-induced diffraction channel transition for incident waves from opposite directions.The asymmetric/symmetric transmission can work in a certain frequency band and a wide incident range.Compared with previous methods using acoustic metasurfaces,our approach has the advantages of simple design and tunable property and shows promise for applications in wavefront manipulation,noise control and one-way propagation.