QoS improving method and system based on service and user priority

The invention relates to a method and system based on service and user priority QoS promotion. The method comprises: step 1, when the available source in WCDMA system is higher than the triggering threshold of QoS promotion, acquiring user priority Prior-u form HLR, the service type Service-Type of each PDF context of the user, the service priority Prior-s, the request QoS grade QoS-R and the protocol QoS grade QoS-N of the user current service; step 2, the network side entity searching the user needing QoS promotion according to the user priority Prior-u, the service priority Prior-s, the request QoS grade QoS-R and the protocol QoS grade QoS-N of the user current service; the network side entity triggering the QoS protocol flow to promote the QoS grade of the user. The invention is able to properly promote the corresponding QoS grade of the user service, and can provide better grouping service load ability to the user and improve the source using rate of the network.