Provided in the embodiments of the present invention are a measurement reporting method and device in a CA system. The method includes: UE receives the message from the network side; according to the message, the said UE judges the component carriers and/or measurement object whether meet the condition of triggering measurement reporting or not; when result is true, UE reports measurement information of at least one component carrier and/or measurement information of at least one measurement object to the network side by measurement report message. In the invention, the UE can report the measurement information of multiple carriers and/or frequencies together, therefore, it simplifies the reporting process, reduces the system time delay, and makes the network side easier to perform carrier management for LTE-A UE.