Abstract: The paper proposes an IPv6-address auto-configuration scheme for wireless sensor networks. In the scheme, one wireless sensor network is divided into a few clusters and the IPv6 address structures for a cluster head and a cluster member are proposed. By adopting Hash division method, IPv6 addresses for cluster heads and cluster members are allocated and the linear probing is used to solve address collision. The performance parameters of the proposed scheme, including duplicate address detection cost, address configuration cost, and address configuration delay time, are analyzed. The experimental results show that the proposed scheme is effectitve and efficient.