A method and a system for improving the QoS of AT interactive data, including: by setting corresponding reverse inter-user QoS attribute parameters of reverse transition probability matrix and/or maximum rate limit etc. for ATs of different QoS levels, the transmission rate of the ATs are adjusted, thereby the ATs of different QoS levels are allowed to enjoy different reverse highest rates and reverse average rates, and the QoS of the AT interactive reserve data is improved. This invention can not only meet the demands of different terminal ATs, but also provide a QoS solution of leveled charging service for network operators, satisfying different AT demands and improving operating income at the same time.