A data offload transmission method, comprising: obtaining, by a base station in a communication network, a transmission performance parameter of a user equipment on a supplementary network of the communication network; and configuring, by the base station, a user transmission restriction according to the transmission performance parameter, and sending the user transmission restriction to the user equipment, for enabling the user equipment to perform data transmission on the supplementary network according to the user transmission restriction; characterized in that the transmission performance parameter comprises at least one of parameters of data transmission time delay and a signal quality parameter; wherein the signal quality parameter comprises a received signal strength indication RSSI; the configuring, by the base station, the user transmission restriction according to the transmission performance parameter, specifically comprises: if the transmission performance parameter satisfies: the data transmission time delay exceeds a preset time delay threshold 1 and/or the RSSI is lower than a preset RSSI threshold 1, then, configuring, by the base station, the user transmission restriction in such a manner that the user equipment stops the data transmission on the supplementary network; if the transmission performance parameter satisfies: the data transmission time delay exceeds the preset time delay threshold 2 and/or the RSSI is lower than the preset RSSI threshold 2, then configuring, by the base station, the user transmission restriction in such a manner that the user equipment decreases a data segment length to a preset segment value; wherein, the preset time delay threshold 1 is larger than the preset time delay threshold 2, and the preset RSSI threshold 1 is smaller than the preset RSSI threshold 2. obtaining, by a base station in a communication network, a transmission performance parameter of a user equipment on a supplementary network of the communication network; and configuring, by the base station, a user transmission restriction according to the transmission performance parameter, and sending the user transmission restriction to the user equipment, for enabling the user equipment to perform data transmission on the supplementary network according to the user transmission restriction; characterized in that the transmission performance parameter comprises at least one of parameters of data transmission time delay and a signal quality parameter; wherein the signal quality parameter comprises a received signal strength indication RSSI; the configuring, by the base station, the user transmission restriction according to the transmission performance parameter, specifically comprises: if the transmission performance parameter satisfies: the data transmission time delay exceeds a preset time delay threshold 1 and/or the RSSI is lower than a preset RSSI threshold 1, then, configuring, by the base station, the user transmission restriction in such a manner that the user equipment stops the data transmission on the supplementary network; if the transmission performance parameter satisfies: the data transmission time delay exceeds the preset time delay threshold 2 and/or the RSSI is lower than the preset RSSI threshold 2, then configuring, by the base station, the user transmission restriction in such a manner that the user equipment decreases a data segment length to a preset segment value; wherein, the preset time delay threshold 1 is larger than the preset time delay threshold 2, and the preset RSSI threshold 1 is smaller than the preset RSSI threshold 2. if the transmission performance parameter satisfies: the data transmission time delay exceeds a preset time delay threshold 1 and/or the RSSI is lower than a preset RSSI threshold 1, then, configuring, by the base station, the user transmission restriction in such a manner that the user equipment stops the data transmission on the supplementary network; if the transmission performance parameter satisfies: the data transmission time delay exceeds the preset time delay threshold 2 and/or the RSSI is lower than the preset RSSI threshold 2, then configuring, by the base station, the user transmission restriction in such a manner that the user equipment decreases a data segment length to a preset segment value; wherein, the preset time delay threshold 1 is larger than the preset time delay threshold 2, and the preset RSSI threshold 1 is smaller than the preset RSSI threshold 2.