Method and system of binding access layer secret key and device

The invention provides a binding method of an access layer secret key and a device, comprising the following steps: an evolution base station binds the access layer secret key with the device, transmits access layer messages to a relay node, and indicates the relay node to binds the access layer secret key and the device; and the relay nodes binds the access layer secret key with the device according to the indication of the access layer messages after receiving the access layer messages. The invention further provides a binding system of the access layer secret key and the device. The invention can ensure that a network side and RN can synchronously generate the same access keys bond with the device, thereby ensuring safe communication.