Embodiments of the present disclosure relate to a method for communication in an unlicensed spectrum and a device. The method includes detecting, by a terminal device, a reference signal. The reference signal is used for indicating that a network device has obtained Channel Occupancy Time (COT). The method further includes detecting, by the terminal device, second information used for indicating data receiving or sending within the COT, after the reference signal has been detected. There are a plurality of the reference signals within the COT.