A method for mapping ACK/NACK response messages, comprising: a UE mapping ACK/NACK response messages corresponding to code word streams to a channel selection mapping table according to at least one of: whether a downlink component carrier or cell is a primary or secondary one, a order of the code word streams of the downlink component carrier or cell and a number of the code word streams contained in the downlink component carrier or cell; and the UE sending the ACK/NACK response messages using a PUCCH format 1b with channel selection; wherein the UE maps the ACK/NACK response messages to the channel selection mapping table according to a number of downlink component carriers or cells that a base station configures for the UE and a transmission mode of each of the configured downlink component carriers; wherein the UE maps the ACK/NACK response messages to the channel selection mapping table according to whether the downlink component carrier or cell is a primary or secondary one and an order of the code word streams of the downlink component carrier or cell, or a number of the code word streams contained in the downlink component carrier or cell; wherein the UE maps the ACK/NACK response messages to the channel selection mapping table according to an order of primary downlink component carriers or cells first and then secondary downlink carriers or cells, or according to a decreasing order defined by a number of the code word streams contained in the downlink component carrier or cell; characterized in that for a channel selection mapping table with M=2, in an FDD system, the ACK/NACK response message of the first code word stream of the primary downlink component carriers or cells is mapped to a first HARQ-ACK bit, and the ACK/NACK response message of the first code word stream of the secondary downlink component carriers or cells is mapped to a second HARQ-ACK bit; in a TDD system, the ACK/NACK response message of the first code word stream of the primary downlink component carriers or cells, or the logical AND result of the ACK/NACK response messages of a first code word stream and a second code word stream of the primary downlink component carriers or cells is mapped to a first HARQ-ACK bit, and the ACK/NACK response message of the first code word stream of the secondary downlink component carriers or cells, or the logical AND result of the ACK/NACK response messages of a first code word stream and a second code word stream of the secondary downlink component carriers or cells is mapped to a second HARQ-ACK bit. a UE mapping ACK/NACK response messages corresponding to code word streams to a channel selection mapping table according to at least one of: whether a downlink component carrier or cell is a primary or secondary one, a order of the code word streams of the downlink component carrier or cell and a number of the code word streams contained in the downlink component carrier or cell; and the UE sending the ACK/NACK response messages using a PUCCH format 1b with channel selection; wherein the UE maps the ACK/NACK response messages to the channel selection mapping table according to a number of downlink component carriers or cells that a base station configures for the UE and a transmission mode of each of the configured downlink component carriers; wherein the UE maps the ACK/NACK response messages to the channel selection mapping table according to whether the downlink component carrier or cell is a primary or secondary one and an order of the code word streams of the downlink component carrier or cell, or a number of the code word streams contained in the downlink component carrier or cell; wherein the UE maps the ACK/NACK response messages to the channel selection mapping table according to an order of primary downlink component carriers or cells first and then secondary downlink carriers or cells, or according to a decreasing order defined by a number of the code word streams contained in the downlink component carrier or cell; characterized in that for a channel selection mapping table with M=2, in an FDD system, the ACK/NACK response message of the first code word stream of the primary downlink component carriers or cells is mapped to a first HARQ-ACK bit, and the ACK/NACK response message of the first code word stream of the secondary downlink component carriers or cells is mapped to a second HARQ-ACK bit; in a TDD system, the ACK/NACK response message of the first code word stream of the primary downlink component carriers or cells, or the logical AND result of the ACK/NACK response messages of a first code word stream and a second code word stream of the primary downlink component carriers or cells is mapped to a first HARQ-ACK bit, and the ACK/NACK response message of the first code word stream of the secondary downlink component carriers or cells, or the logical AND result of the ACK/NACK response messages of a first code word stream and a second code word stream of the secondary downlink component carriers or cells is mapped to a second HARQ-ACK bit.