In order to improve the stability and efficiency of the application layer multicast spanning tree, a multi-domain clustering topology-aware application layer multicast algorithm was proposed based on domain perception. Mul-Dom CTA algorithm not only can close organization of nodes in a topology domain through the link transmission delay, so as to realize the transmission of packets, but also can redirect nodes through the node degrees of constraint, alleviating the negative impact of the joining in a different order, building a relatively stabl...