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Through analyzing the 3G security services structure, we found that 3GPP did not offer effective authentication services to the terminal client in application domain. On the base of analyzing the Kerberos authentication method and the 3G security mechanism, we first put forward a three-tier security authentication service model for 3G terminal application. The model assembled and encapsulated the 3G security algorithm, and offered a reliable. Proactive and convenient authentication services to the 3G terminal application. This research provided strong support with 3G terminal application.