A　novel　quantum　key　distribution　protocol　based　on　entanglement　and　dense　coding　is　proposed,　which　does　not　need　to　store　the　qubits.　Every　four　particles　is　divided　into　a　group,　of　which　{　(1,　2),　(3,　4)　}　or　{　(1,　3),　(2,　4)　}　are　in　entanglement.　Some　of　the　groups　are　used　to　transfer　the　message,　and　the　others　are　used　to　check　the　eavesdropping.　In　the　message　mode,　the　authorized　party　needn’t　to　know　the　location　information　of　the　group,　he　only　needs　to　make　the　unitary　operation　to　the　first　and　the　forth　of　the　group.　Also,　the　trade-off　between　information　and　disturbance　is　calculated　under　the　intercept-measure-resend　attack　and　entanglement-measure　attack,　which　tells　that　the　protocol　is　asymptotically　secure.　Moreover,　the　quantum　circuit　simulation　of　the　protocol　is　shown.　©　ICST　Institute　for　Computer　Sciences,　Social　Informatics　and　Telecommunications　Engineering　2019.