IP network is widely applied in internet nowadays, Further be applied in a variety of telecommunications service bearing. but the design principles of the traditional IP network is to provide the service of best effort, and can’t meet the high reliability requirements of real-time business such as IP telephone and video conference. This paper will introduce the IP FRR of BFD rapid detection mechanism, which is presented to repair failure rapidly, reduce the packet dropout. And also the detection technology of BFD and the principle of IP FRR will be introduced in detail. At last, the result of experimentation is provided.