Trigger method for aperiodic channel status information reports and base station

The invention discloses a trigger method for aperiodic channel status information reports and a base station. The method comprises the following steps of: sending a Physical Downlink Control Channel (PDCCH) with aperiodic CSI report trigger command to the user equipment by the base station; when the trigger command triggers the aperiodic CSI report, indicating the aperiodic CSI report about the component carrier back-fed and designated by the user equipment through the PDCCH. The invention enhances the flexibility of the aperiodic channel status information CSI reports, reduces the trigger delay of the aperiodic channel status information CSI reports, and saves the trigger signaling cost and the transmission cost.