A method for reporting Power Headrooms, PHs, under carrier aggregation, wherein a plurality of downlink carriers are aggregated for a user equipment, and the plurality of carriers are grouped into a plurality of sets of carriers; for each of the sets of carriers, an uplink carrier linked to specified one of the downlink carriers in the set of carriers is specified as an uplink carrier, on which a Physical Uplink Control Channel, PUCCH, can be transmitted, corresponding to the set of carriers; and the method comprises: generating, by the user equipment, a Type 1 PH and a Type 2 PH for each of a plurality of uplink carriers, on which PUCCHs can be transmitted, for which PHs need to be reported; and generating a Type 1 PH for each of uplink carriers, for which PHs need to be reported, other than the uplink carriers on which PUCCHs can be transmitted; and reporting, by the user equipment, the generated respective Type 1 PH and Type 2 PH to the network side in a current uplink sub-frame; wherein generating, by the user equipment, the Type 1 PH and/or the Type 2 PH comprises: for each of the uplink carriers on which PUCCHs can be transmitted and the uplink carriers other than the uplink carriers on which PUCCHs can be transmitted, generating, by the user equipment, the Type 1 PH of the uplink carrier according to uplink transmission related information of uplink carriers linked to the respective downlink carriers in the set of carriers corresponding to the uplink carrier; and for each of the uplink carriers on which PUCCHs can be transmitted, generating, by the user equipment, the Type 2 PH of the uplink carrier according to the uplink transmission related information of the uplink carriers linked to the respective downlink carriers in the set of carriers corresponding to the uplink carrier; wherein the set of carriers corresponding to the uplink carrier refers to the set of carriers to which the downlink carrier linked to the uplink carrier belongs. generating, by the user equipment, a Type 1 PH and a Type 2 PH for each of a plurality of uplink carriers, on which PUCCHs can be transmitted, for which PHs need to be reported; and generating a Type 1 PH for each of uplink carriers, for which PHs need to be reported, other than the uplink carriers on which PUCCHs can be transmitted; and reporting, by the user equipment, the generated respective Type 1 PH and Type 2 PH to the network side in a current uplink sub-frame; wherein generating, by the user equipment, the Type 1 PH and/or the Type 2 PH comprises: for each of the uplink carriers on which PUCCHs can be transmitted and the uplink carriers other than the uplink carriers on which PUCCHs can be transmitted, generating, by the user equipment, the Type 1 PH of the uplink carrier according to uplink transmission related information of uplink carriers linked to the respective downlink carriers in the set of carriers corresponding to the uplink carrier; and for each of the uplink carriers on which PUCCHs can be transmitted, generating, by the user equipment, the Type 2 PH of the uplink carrier according to the uplink transmission related information of the uplink carriers linked to the respective downlink carriers in the set of carriers corresponding to the uplink carrier; wherein the set of carriers corresponding to the uplink carrier refers to the set of carriers to which the downlink carrier linked to the uplink carrier belongs. for each of the uplink carriers on which PUCCHs can be transmitted and the uplink carriers other than the uplink carriers on which PUCCHs can be transmitted, generating, by the user equipment, the Type 1 PH of the uplink carrier according to uplink transmission related information of uplink carriers linked to the respective downlink carriers in the set of carriers corresponding to the uplink carrier; and for each of the uplink carriers on which PUCCHs can be transmitted, generating, by the user equipment, the Type 2 PH of the uplink carrier according to the uplink transmission related information of the uplink carriers linked to the respective downlink carriers in the set of carriers corresponding to the uplink carrier; wherein the set of carriers corresponding to the uplink carrier refers to the set of carriers to which the downlink carrier linked to the uplink carrier belongs.