Abstract: Based on elaborate analysis of the FMIPv6 technology, an improved fast handover program is proposed. The NCoA of mobile node will be configured according to the user list of the NAR, thus avoiding duplicate address detection of NCoA, thereby increasing FMIPv6 overall handover performance. Finally, we use OPNET to do simulation experiments, showing that the program can shorten the handover delay and packet loss rate and it is an effective and viable program.