Because of character of far accessing distance

low price and long life-span of electronic tag

many countries are attracted to UHF passive RFID technique.On the first hand

principle of UHF passive RFID system is introduced.On the second hand

interferences to UHF RFID system and accessing distance are analyzed.On the last hand

interference suppression and deployment strategy are given

and are meaningful to popularize application of UHF passive RFID technique.