A data transmission method, comprising: communicating, by a first router, with a second router over multiple radio links; acquiring, by the first router, status information of each radio link; determining, by the first router, a transmission overhead of each radio link according to the status information of each radio link; determining, by the first router, load sharing of each radio link according to the transmission overhead of each radio link; and sending, by the first router, data to the second router according to the load sharing of each radio link; wherein the status information comprises a network standard and a received signal strength indicator, RSSI, and further comprises connection duration of a radio link or statistics traffic of a radio link; wherein the determining, by the first router, a transmission overhead of each radio link according to the status information of each radio link comprises: for each radio link, determining, by the first router, whether connection duration of the radio link exceeds a monthly duration quota, or whether statistics traffic of the radio link exceeds a monthly traffic quota; and if the connection duration exceeds the monthly duration quota or the statistics traffic exceeds the monthly traffic quota, using, by the first router, a preset upper limit of a transmission overhead as the transmission overhead of the radio link; or if the connection duration does not exceed the monthly duration quota or the statistics traffic does not exceed the monthly traffic quota, determining the weight corresponding to the network standard of the radio link and the weight corresponding to the RSSI of the radio link; and determining the transmission overhead of the radio link according to the weight corresponding to the network standard of the radio link and the weight corresponding to the RSSI of the radio link. communicating, by a first router, with a second router over multiple radio links; acquiring, by the first router, status information of each radio link; determining, by the first router, a transmission overhead of each radio link according to the status information of each radio link; determining, by the first router, load sharing of each radio link according to the transmission overhead of each radio link; and sending, by the first router, data to the second router according to the load sharing of each radio link; wherein the status information comprises a network standard and a received signal strength indicator, RSSI, and further comprises connection duration of a radio link or statistics traffic of a radio link; wherein the determining, by the first router, a transmission overhead of each radio link according to the status information of each radio link comprises: for each radio link, determining, by the first router, whether connection duration of the radio link exceeds a monthly duration quota, or whether statistics traffic of the radio link exceeds a monthly traffic quota; and if the connection duration exceeds the monthly duration quota or the statistics traffic exceeds the monthly traffic quota, using, by the first router, a preset upper limit of a transmission overhead as the transmission overhead of the radio link; or if the connection duration does not exceed the monthly duration quota or the statistics traffic does not exceed the monthly traffic quota, determining the weight corresponding to the network standard of the radio link and the weight corresponding to the RSSI of the radio link; and determining the transmission overhead of the radio link according to the weight corresponding to the network standard of the radio link and the weight corresponding to the RSSI of the radio link. for each radio link, determining, by the first router, whether connection duration of the radio link exceeds a monthly duration quota, or whether statistics traffic of the radio link exceeds a monthly traffic quota; and if the connection duration exceeds the monthly duration quota or the statistics traffic exceeds the monthly traffic quota, using, by the first router, a preset upper limit of a transmission overhead as the transmission overhead of the radio link; or if the connection duration does not exceed the monthly duration quota or the statistics traffic does not exceed the monthly traffic quota, determining the weight corresponding to the network standard of the radio link and the weight corresponding to the RSSI of the radio link; and determining the transmission overhead of the radio link according to the weight corresponding to the network standard of the radio link and the weight corresponding to the RSSI of the radio link.