Abstract: A Partial-state IPv6 NAT method was proposed, which could be used to support the address transition from shorter prefix address to longer one. Meanwhile, this method is able to reduce the recording of the translation information as much as possible in order to decrease the load of translation equipment. The experiments show that the proposed method is able to realize the partial-state translation for the IPv6 addresses with arbitrary length. Moreover, it is able to keep the checksum-neutral at the transport layer and avoid port translation, with which it is able to provide transparency for transport layer and application layer protocols. This method, which is more universal, is complementary solution for IPv6 prefix stateless translation.