This paper presents an application-level multicast using a tree-bone overlay and an auxiliary mesh.We firstly define the strictly simple reso urce tree-based overlay

and then propose the relaxed simple reso urce tree-based overlay according to the observation of self-contained performance of peers in pervasive environment.Next we analyze the churn of tree-based overlay and the resulting issue of bandwidth bottleneck.With an auxiliary mesh and state transitions based on the dynamic size of bandwidth

we design an adaptive bandwidth strategy which enables the multicast better bandwidth utilization and usability.Experimental results show that the application-level multicast achieves a good performance.