A method and an apparatus for maintenance of a bandwidth part. The method and apparatus resolve an issue of the prior art in which expiration of a bandwidth part deactivation timer during a random access process changes the bandwidth part to a default bandwidth part, such that data cannot be transmitted on an optimal bandwidth part, and may even cause an interruption of an ongoing data transmission, while also affecting an ongoing random access process. In embodiments of the present invention, a terminal keeps a current active bandwidth part unchanged during a random access process, and performs a restart operation of a bandwidth part deactivation timer after the random access process is successfully completed, such that a situation where a bandwidth part changes to a default bandwidth part does not occur during the random access process, thereby reducing interruption to ongoing data transmissions and reducing the impact on ongoing random access processes.