Based　on　the　finite　element　method,　the　band　gap　of　the　phononic　crystal　in　single-sided　cylinder　local　resonance　was　analyzed,　and　the　influence　of　structural　parameters　on　the　phononic　crystal　was　studied.　The　results　show　that　the　initial　frequency　of　the　first　complete　band　gap　decreases　and　the　bandwidth　increases　with　the　increase　of　the　height　of　the　scatterer.　With　the　increase　of　the　thickness　of　the　substrate,　the　initial　frequency　of　the　single-sided　cylindrical　phononic　crystal　increases　gradually,　the　cut-off　frequency　first　increases　and　then　decreases.　In　addition,　based　on　the　classical　single-sided　cylindrical　phononic　crystal,　two　new　ternary　single-sided　cylindrical　phononic　crystal　structures　are　combined:　embedded　single-sided　cylindrical　phononic　crystal　(Hereinafter　referred　to　as　structure　Ⅰ)　and　bonded　single-sided　cylindrical　phononic　crystal　(Hereinafter　referred　to　as　structure　Ⅱ).　Through　the　analysis　of　the　band　gap　characteristics,　it　is　concluded　that　the　two　new　structures　have　lower　frequency　band　gap　compared　with　the　classical　single-sided　cylindrical　phononic　crystals,　which　is　very　beneficial　for　low-frequency　vibration　and　noise　reduction.　The　results　of　this　paper　will　provide　some　theoretical　guidance　for　practical　engineering　application.　©　2021,　Journal　of　Synthetic　Crystals　Press.　All　right　reserved.