Based　on　researching　of　Bluetooth　Protocol,　a　kind　of　Bluetooth　data　transferring　system　based　on　MCU-controlling　has　been　proposed　in　the　paper.　In　the　system,　the　MCU　in　which　the　Bluetooth　HCI　protocol　has　been　embedded　is　used　to　control　the　Bluetooth　module　on　UART　and　make　the　Bluetooth　devices　in　the　Bluetooth　network　establish　connection　and　transfer　data　automatically.　In　the　hardware　design,　the　chip　C8051F020　is　selected　as　the　host　controller.　Because　chip　C8051F020　has　two　UART　serial　interfaces,　it　can　meet　the　requirement　of　design,　simplify　the　circuit　and　enhance　system　anti-jamming　capability.　The　Bluetooth　module　used　in　the　system　is　CSR　Bluetooth　Core　4　with　Bluetooth　Standard　2.0　class　1　which　has　the　advantages　of　high　signal　sensitivity,　long　distance　of　connection　and　easy　to　use..　(C)　2011　Published　by　Elsevier　Ltd.　Selection　and/or　peer-review　under　responsibility　of　Harbin　University　of　Science　and　Technology