A method for calculating a correction coefficient for correcting transmit/receive channels between a first remote radio unit, RRU, and a second RRU, wherein the first RRU comprises a first antenna and a second antenna, the second RRU comprises a third antenna and a fourth antenna, and the method comprises: sending, by the first RRU, a first correction reference signal to the third antenna and the fourth antenna through the first antenna by using a first transmit power and a first weight vector; sending, by the first RRU, a second correction reference signal to the third antenna and the fourth antenna through the second antenna by using the first transmit power and the first weight vector; receiving, by the first RRU through the first antenna and the second antenna, a third correction reference signal sent by the second RRU through the third antenna by using a second transmit power and a second weight vector; receiving, by the first RRU through the first antenna and the second antenna, a fourth correction reference signal sent by the second RRU through the fourth antenna by using a second transmit power and a second weight vector, wherein the first transmit power is a transmit power in a preset first transmit power set, and the first weight vector is a weight vector in a preset first weight vector set; and the second transmit power is a transmit power in a preset second transmit power set, and the second weight vector is a weight vector in a preset second weight vector set; and combining a correction reference signal received by the third antenna and a correction reference signal received by the fourth antenna into a fifth correction reference signal, and combining a correction reference signal received by the first antenna and a correction reference signal received by the second antenna into a sixth correction reference signal, wherein the fifth correction reference signal and the sixth correction reference signal are used to calculate a correction coefficient of the transmit/receive channels between the first RRU and the second RRU, wherein an optional set comprises at least one optional subset, the optional subset comprises a transmit power and a weight vector that can be used by the first RRU, and a transmit power and a weight vector that can be used by the second RRU, and a first optional subset in the at least one optional subset comprises the first transmit power, the first weight vector, the second transmit power, and the second weight vector. sending, by the first RRU, a first correction reference signal to the third antenna and the fourth antenna through the first antenna by using a first transmit power and a first weight vector; sending, by the first RRU, a second correction reference signal to the third antenna and the fourth antenna through the second antenna by using the first transmit power and the first weight vector; receiving, by the first RRU through the first antenna and the second antenna, a third correction reference signal sent by the second RRU through the third antenna by using a second transmit power and a second weight vector; receiving, by the first RRU through the first antenna and the second antenna, a fourth correction reference signal sent by the second RRU through the fourth antenna by using a second transmit power and a second weight vector, wherein the first transmit power is a transmit power in a preset first transmit power set, and the first weight vector is a weight vector in a preset first weight vector set; and the second transmit power is a transmit power in a preset second transmit power set, and the second weight vector is a weight vector in a preset second weight vector set; and combining a correction reference signal received by the third antenna and a correction reference signal received by the fourth antenna into a fifth correction reference signal, and combining a correction reference signal received by the first antenna and a correction reference signal received by the second antenna into a sixth correction reference signal, wherein the fifth correction reference signal and the sixth correction reference signal are used to calculate a correction coefficient of the transmit/receive channels between the first RRU and the second RRU, wherein an optional set comprises at least one optional subset, the optional subset comprises a transmit power and a weight vector that can be used by the first RRU, and a transmit power and a weight vector that can be used by the second RRU, and a first optional subset in the at least one optional subset comprises the first transmit power, the first weight vector, the second transmit power, and the second weight vector.