The invention relates to a network service control method, where the network service is transmitted between terminals through policy executing point, and the method comprises the steps of: (a) policy executing point obtains dynamic depth data packet detecting policy from policy making point; (b) the policy executing point processes data stream coming from terminals according to the detecting policy. And it also provides a network service control system. And it implements differentiated quality of service assurance for different users to use network services; besides, it implements control of network services, thus reducing network operating cost. |