Wireless multimedia network will be on the basis of the packet technology,support the transmission of multi-traffic,and accordingly cause the great challenge for the QoS guarantee.The operators will define the QoS of traffic according to their requirements,and provide the traffic with different QoS requirements.Call admission control will aim at the packet traffic,guarantee the different QoS requirements,and maximize the system utilization.In this paper,a novel QoS based CAC policy for the asymmetric traffic in symmetrical CDMA systems is proposed.The operators can define the priorities of all kinds of traffic according to their demands.And as the presence of asymmetric traffic in the wireless network,the channel resource should be assigned fairly and reasonably according to the working states.The free resource will be assigned to the traffic with higher priority.The simulation results show that this policy can guarantee the QoS of different traffic efficiently,and improve the resource utility significantly.