A method, device, and system for establishing a label switching path (LSP) in fast rerouting (FRR) switching are provided, which can ensure that an ingress point and a merge point (MP) refresh path information in time. The method includes that first messages are respectively sent to an ingress point and an MP on an LSP, where the first messages carry information of holding a path refreshing state, so that the ingress point and MP determine the time of holding the path refreshing state according to the information of holding the path refreshing state; and second messages are respectively sent to the ingress point and the MP in the time of holding the path refreshing state, where the second messages carry information of refreshing a path state, so that the ingress point and MP establish the LSP according to the information of refreshing the path state.