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On the basis of the analysis of WLAN (Wireless Local Area Network) security authentication based on 802.1x/EAP (Extensible Authentication Protocol), the EAP/TLS (Transport Layer Security) is selected through comparing several common authentication solutions. The principles of EAP/TLS authentication, the mechanisms of session key derivation, the detailed procedures of authentication, and the validation lab to test the EAPTLS deployment in the meteorological network are described. The EAPTLS authentication technology proved feasible and practical. In combination with the current status of the system, two problems are discussed, i.e., reliability and applicability of the authentication and DHCP servers, encountered in the application of EAP/TLSbased WLAN in the meteorological network system in China.