For the purpose of realizing the anycast communicate more efficiently
the article is proposed an anycast routing algorithm based on Multi-Cores Uni-Directional Shared Trees based on the analysis of advantages and disadvantages about the existing anycast routing algorithm PIA-SM and CBT
and presented the choice strategy of the core nodes and the anycast group members.The experiments show that the algorithm can balance the network and server load
and reduce the transmission delay efficiently under the heavy network load.