Abstract: Admission control decides if a new stream service request can meet the limitation of the network load without destroying the QoS(Quality of Service) to the stream already exist. In fact, the network cannot often meet the full request of the network load, admission control also take charge of deciding when to bring a busy signal. Based on parameters and on measurement ,all kinds of admission control technology were analysised, their differences were compareanded,the virtue and the shortcoming of corresponding technology were analysised. As a result, it can provide a basis to enhance QoS and the value in use of Internet. Admission control is the important step in the distribution of network resource, and the efficiency method to implement logical distribution. Admission control can finally realize Internet QoS.

Key words: distribution of network resource, quality of service(QoS), admission control