A method for contention window adjustment, comprising: receiving (S301, S1101), by a first device, multiple pieces of response information from at least one second device, the response information corresponding to at least one data packet transmitted on a first channel, and each piece of response information of the multiple pieces of response information comprising acknowledgment, ACK, information or negative acknowledgment, NACK, information; characterized by: obtaining (S302, S1102), by the first device, first information according to the multiple pieces of response information, comprising: obtaining, by the first device, a first value according to a ratio of a quantity of pieces of ACK information in the multiple pieces of response information to a total quantity of pieces of the multiple pieces of response information, wherein, if the first value is greater than a preset first threshold, the first information is equivalent ACK information, or obtaining, by the first device, a second value according to a ratio of a quantity of pieces of NACK information in the multiple pieces of response information to a total quantity of pieces of the multiple pieces of response information, wherein, if the second value is greater than a preset second threshold, the first information is equivalent NACK information; and adjusting (S303, S1103), by the first device, a contention window according to the first information, comprising: if the first information is the equivalent NACK information, increasing, by the first device, the contention window of the first device on the first channel; and if the first information is the equivalent ACK information, decreasing, by the first device, the contention window of the first device on the first channel. receiving (S301, S1101), by a first device, multiple pieces of response information from at least one second device, the response information corresponding to at least one data packet transmitted on a first channel, and each piece of response information of the multiple pieces of response information comprising acknowledgment, ACK, information or negative acknowledgment, NACK, information; characterized by: obtaining (S302, S1102), by the first device, first information according to the multiple pieces of response information, comprising: obtaining, by the first device, a first value according to a ratio of a quantity of pieces of ACK information in the multiple pieces of response information to a total quantity of pieces of the multiple pieces of response information, wherein, if the first value is greater than a preset first threshold, the first information is equivalent ACK information, or obtaining, by the first device, a second value according to a ratio of a quantity of pieces of NACK information in the multiple pieces of response information to a total quantity of pieces of the multiple pieces of response information, wherein, if the second value is greater than a preset second threshold, the first information is equivalent NACK information; and adjusting (S303, S1103), by the first device, a contention window according to the first information, comprising: if the first information is the equivalent NACK information, increasing, by the first device, the contention window of the first device on the first channel; and if the first information is the equivalent ACK information, decreasing, by the first device, the contention window of the first device on the first channel. obtaining, by the first device, a first value according to a ratio of a quantity of pieces of ACK information in the multiple pieces of response information to a total quantity of pieces of the multiple pieces of response information, wherein, if the first value is greater than a preset first threshold, the first information is equivalent ACK information, or obtaining, by the first device, a second value according to a ratio of a quantity of pieces of NACK information in the multiple pieces of response information to a total quantity of pieces of the multiple pieces of response information, wherein, if the second value is greater than a preset second threshold, the first information is equivalent NACK information; and adjusting (S303, S1103), by the first device, a contention window according to the first information, comprising: if the first information is the equivalent NACK information, increasing, by the first device, the contention window of the first device on the first channel; and if the first information is the equivalent ACK information, decreasing, by the first device, the contention window of the first device on the first channel. if the first information is the equivalent NACK information, increasing, by the first device, the contention window of the first device on the first channel; and if the first information is the equivalent ACK information, decreasing, by the first device, the contention window of the first device on the first channel.