data is very short and since it is microwave radiation and has a low frequency,the probability of being stolen is low.This ensures that the security of the data collection phase. 2)Improve the toll efficiency:Use RFID in expressway automatic toll collection system can achieve the non-stop toll system,which will increase the speed of toll collection in large amplitude.This will greatly reduce the probability of traffic gam and improve the efficiency. 3)Improve the service level:The speed of toll collection will be increased. Besides,this will solve the problems in labor management,such as receiving fake money,counting the wrong price and the toll collector taking the money into their own pocket.The banking system offers lots of conveniences.Users can recharge the card by jointing it with their bank card,or use credit card,which is very convenient. 5.The problem of expressway automatic toll collection system Because China has a large scale of expressway network,if the automatic toll collection system is used,it needs a very large scale.It needs a high amount of initial investment and a long period for the construction,the investment risk is high.Besides, the traffic volume of many toll stations is small.Without the full coverage of the entire network,the reliability and effectiveness of the automatic toll collection system can't be guaranteed. Summary First,point out the existing problems and shortcoming of the expressway toll collection system;then analyses the basic concepts and key technology of RFID Using RFID in expressway toll collection system can achieve non-stop,ease traffic congestion,reduce accident rate caused by traffic pressure and improve the charging efficiency and reduce the potential security risks.However,it still has some problems in promoting,the technology needs to be upgrated.data is very short and since it is microwave radiation and has a low frequency, the probability of being stolen is low. This ensures that the security of the data collection phase.2) Improve the toll efficiency: Use RFID in expressway automatic toll collection system can achieve the non-stop toll system, which will increase the speed of toll collection in large amplitude. This will greatly reduce the probability of traffic gam and improve the efficiency. 3) Improve the service level: The speed of toll collection will be increased. Besides, this will solve the problems in labor management, such as receiving fake money, counting the wrong price and the toll collector taking the money into their own pocket. The banking system offers lots of conveniences. Users can recharge the card by jointing it with their bank card, or use credit card, which is very convenient. 5. The problem of expressway automatic toll collection system Because China has a large scale of expressway network, if the automatic toll collection system is used, it needs a very large scale. It needs a high amount of initial investment and a long period for the construction, the investment risk is high. Besides, the traffic volume of many toll stations is small. Without the full coverage of the entire network, the reliability and effectiveness of the automatic toll collection system can’t be guaranteed. Summary First, point out the existing problems and shortcoming of the expressway toll collection system; then analyses the basic concepts and key technology of RFID. Using RFID in expressway toll collection system can achieve non-stop, ease traffic congestion, reduce accident rate caused by traffic pressure and improve the charging efficiency and reduce the potential security risks. However, it still has some problems in promoting, the technology needs to be upgrated