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Cdma2000 mobile network uses AAA (Authentication Authorization Accounting) mechanism to realize the control of the accessing of mobile user. Aiming at the theft problem of copy cards in cdma2000 mobile network, the paper analysed the traditional mechanism of AAA and its problems in depth and designed a new AAA business access process. Base on the platform of AAA, the paper advanced the module of analyzing the accessing of copy card and realized the recognition and record of the behaviour of the accessing of copy card. At last, the effectiveness of the new AAA business process was verified and the security of cdma2000 mobile network was improved.