The topological valley transport,realized in phononic crystals,has aroused tremendous interest in these years.Many previous researches have further promoted the development of this transport phenomenon.Crucially,the bandwidth of the valley-projected edge mode has been an essential research topic.As is well known,the broadband will improve the adaptability of the acoustic edge-states,which will be more conducive to the transmission of information.Therefore,in this paper,we present a composite structure,composed of the atoms with different shapes forming a hexagonal lattice,which can achieve larger bandwidth than a single structure.Meanwhile,the results demonstrate that the topological protected edge states are also observed in our structure.Furthermore,the backscattering suppressions from associated valley-protected edge states under certain perturbations have also been investigated and demonstrated.Our work can provide a new idea for designing acoustic devices based on valley degree of freedom.