With the rapid growth and development of Internet

it will become the ultimate platform which provides all kinds of network services.Among these network services based on the Internet platform

there are not only best-effort services

but also quality-guaranteed services

[1]

.In this article

we discuss the issues on how to support quality services of multicast communications on the network layer by way of QoS(Quality of Service) routing strategy.Currently

there have been many multicast QoS routing algorithms proposed in literature.All these algorithms achieved lots of exciting results in network resource utilization and throughput

but still have some problems to be improved.Based on these problems

we proposed our QoS routing algorithm

and the e

xperiment shows that compared to the other proposed algorithms

our algorithm has many improvements on adaption to network topology

network size

symmetric and asymmetric link load.