DHCP services are widely used in large-scale network infrastructure. In order to setup secure, reliable DHCP Server, the authors study the Failover protocol and design experiment on the application of DHCP Failover Server based on the LINUX environment. This paper describes in detail the configuration of DHCP Failover Server in the experiment, network security configuration and the verification of experimental results. The experiment shows that a disaster backup of DHCP Server effectively ensures the stability of users' network and improves the efficient in the use of IP resources.