A method for receiving uplink control information in a wireless communication system supporting carrier aggregation (CA), and a base station therefore are discussed. The method according to one embodiment includes transmitting downlink data through a first downlink component carrier (DL CC) or a second DL CC; receiving an acknowledgement/not-acknowledgement (ACK/NACK); and receiving periodic channel state information (CSI). If the ACK/NACK collides with the periodic CSI and the ACK/NACK corresponds to downlink data transmitted through only the first DL CC, both the ACK/NACK and the periodic CSI are received in the same subframe of a first uplink component carrier (UL CC). If the ACK/NACK collides with the periodic CSI and the ACK/NACK corresponds to downlink data transmitted through both the first DL CC and the second DL CC, the periodic CSI is not received and only the ACK/NACK is received in the same subframe of the first UL CC.