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In Mobile IPv6 (MIPv6), a mobile node (MN) often needs to send binding update (BU) messages to the distant home agent (HA) and the correspondent nodes (CNs), when it is far away from the home network and the CNs, or in the frequent moving environment. This process increases handoff latency as well as lots of interactive signaling and network load. In order to improve handoff performance and implement seamless roaming, it is necessary to improve handoff process of MIPv6 protocol. In this paper, we analyze the handoff performance for HMIPv6, and then propose handoff algorithm based on Care-of Address Pool for Hierarchical Mobile IPv6 (CoAP-HMIPv6). Performance analysis and simulation experiments presented in this paper show that our proposal can be used to solve the problems with MIPv6 handoff communication.