A method for processing quality of service, an application server, a QoS control network element, and a mobile network id disclosed. The method includes: obtaining initial quality of service QoS information of a user equipment in a mobile network; determining, according to the initial QoS information, to request the mobile network to increase a QoS level of the user equipment; sending a QoS improving request to a QoS control network element to request for increasing the QoS level of the user equipment; and receiving a QoS improving response, where the QoS improving response includes enhanced QoS information assigned by the mobile network for the user equipment. The method for processing quality of service, the application server, the QoS control network element, and the mobile network according to embodiments of the present invention can dynamically adjust the QoS level of the user equipment, thereby improving user experience.