The invention discloses a wireless transmission method and device. The method comprises the following step: UE receives a synchronous signal on a first carrier, and then receives a first wireless signal in a first time window of the first carrier, wherein the synchronous signal corresponds to a first type of CP, the first wireless signal is transmitted on a physical layer channel other than a PMCH, and the first wireless signal corresponds to a second type of CP. According to the wireless transmission method and device disclosed by the invention, when a given time window is allocated for MBMS transmission under narrow-band communication, the given time window can still support unicast communication; the problem that time domain resources reserved for a narrow-band MBMS cannot be used for the unicast communication can be solved; and thus the phenomenon that frequency bands on the time domain resources reserved for the narrow-band MBMS are wasted can be avoided, and the spectrum efficiency of the system can be improved.