The present disclosure relates to methods for sending a message. One example method is applied to a terminal device and includes sending a request sequence to a network device, receiving a response message sent by the network device, where the response message indicates a time-frequency resource that the network device allocates to the terminal device in response to the request sequence, and sending an indication message to the network device on the time-frequency resource, where the indication message indicates that the request sequence is used for at least one of the following: requesting beam recovery, requesting data scheduling, and requesting beam adjustment.