Embodiments of the present invention disclose a trigger method and related apparatus. The embodiments of the present invention include: determining time-frequency resource configuration information of a physical trigger channel PTCH; detecting one PTCH on a time-frequency resource occupied by the one PTCH indicated by the time-frequency resource configuration information of the PTCH; determining whether triggering exists according to a PTCH detection result, where the triggering is used to indicate that first information needs to be transmitted in a first information subframe or a first information opportunity associated with the PTCH; and transmitting the first information in the first information subframe or the first information opportunity associated with the PTCH if it is determined that the triggering exists.