The　propagation　of　acoustic　wave　in　a　two-dimensional　phononic　crystal　of　a　hybrid　triangular　graphite　array　is　investigated　by　the　plane　wave　expansion　(PWE)　method.　Our　numerical　results　show　that　the　location　and　width　of　the　band　gaps　can　be　tuned　by　altering　the　radii　of　scatters　at　different　positions.　(C)　2009　Elsevier　B.V.　All　rights　reserved.