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Peer-to-peer overlay is self-organized by individual hosts in the Internet. The overlay usually serves for collaboration-oriented applications and necessitates group communication. Consequently, anonymity is demanded in scenarios such as military, government applications for privacy protection. It prevents communicating party identity from being revealed by others. In this paper we propose Bus-based anonymous multicast upon peer-to-peer overlay, which delivers message from originator to consumers anonymously. The Bus rotates over an Euler tour formed by hosts and takes intentional messages to respective consumers. Theoretical analysis demonstrates that bus-based anonymous multicast gets higher anonymity level comparing to existing ones.