This wireless network security with AAA protocol also used authentication, authorization and accounting of the users intending to get access to the Internet through a secured network. The RADIUS protocol is used to encapsulate the packets of the, MSCHAPv1, and MSCHAPv2 legacy authentication protocols, while the MD4, MD5, salted MD5 and SHA-1 hashing. Algorithms are used to provide an enhanced security for the user passwords. The AAA-RADIUS solution is implemented using the 8950 AAA software from Alcatel-Lucent. It has obvious advantage to adopt 802.1 x authentications for network access control. This paper analyzes 802.1x protocol, EAP protocol and RADIUS protocol, and constructs AAA which is based on 802.1 x authentications at the end. Using software the messages of the whole authentication process have been captured. According to AAA mechanism it analyzes EAP messages and RADIUS messages detailed. The analysis of these messages provides technology strongly for particular research and further improvement, and it has important value for research and application.