Retransmission method in communication system

The invention provides a retransmission method in a communication system. The method comprises the following steps that: after a receiving terminal receives retransmission data sent by a sending terminal, combination processing is carried out on the received data at this time and previous received data; independent decoding is carried out on the received data at this time; if the independent decoding is successful or a receiving result of the combination processing is correct, ACK information is feedbacked to the sending terminal; and if the independent decoding is failed and the receiving result of the combination processing is incorrect, NACK information is feedbacked to the sending terminal. According to the invention, inconsistence of data of receiving and sending terminals during an HARQ process can be avoided; and a diversity gain will not be lost.