With the rapid development of networks and applications

Internet is required to not only provide the Best Effort service

but also supply services of various traffic classes and multiple priorities.DiffServ architecture is considered to be the promising Internet framework meeting QoS requirements.One of crucial elements in DiffServ is the network node scheme.In this paper

we propose a novel DiffServ node mechanism called combining Buffer Management and Active Queue Management (comBAQ).We detail comBAQ service framework and its packet judgment process.Simulation results demonstrate that comBAQ is capable of simultaneously achieving our five targets and provides service differentiation in terms of packet drop priority:the More Guaranteed (MG) service for reliable traffics and the Less Guaranteed (LG) service for traditional application flows.