Provided in the embodiments of the application are a Discontinuous Reception (DRX) method and device. The method includes that: a terminal device determines a first service type, the first service type being a service type of a service which is being transmitted between the terminal device and a network device; the terminal device determines a first length according to the first service type; and the first length is determined by the terminal device as a length of a timer for DRX of the first service type. According to the DRX method and device of the embodiments of the application, the length of the timer for DRX may be flexibly configured, and a signaling overhead is reduced.