In　view　of　the　defects　of　large　size　and　difficult　updating　for　existing　RFID　readers,　due　to　the　fact　that　FPGA　can　be　programmed　repeatedly　and　dynamically　and　be　used　conveniently,　RFID　reader　is　studied　based　on　FPGA.　The　reader　possesses　the　advantages　of　flexible　structure,　small　size,　easily　upgrading　and　convenient　realization　of　different　external　interfaces,　and　etc.　FPGA　chip　acts　as　kernel　of　the　reader,　implementing　the　interface　for　various　kids　of　devices　the　reader.　Interrupt　service　routine　for　COM　port　is　used　to　receive　tag＇　data,　LCD　displays　tag＇　data.　The　editing,　debugging　and　combination　of　the　programs　are　finished　in　FPGA＇　integrated　software　environment,　and　the　program　codes　are　downloaded　to　the　chip　to　implement　its　functions　through　specialized　cable.　Experimental　result　shows　that　the　FPGA　can　effectively　realize　RFID　reader.　This　design　not　only　reduces　the　size　of　RFID　reader,　but　also　reduces　the　power　consumption,　thus　it　has　wide　application　prospect.