A gateway data transmission method, comprising the steps of: transmitting, by a cellular access network of a cellular network, to a dual mode gateway a message that requests to establish a wireless air interface bearer between the cellular access network and the dual mode gateway, upon reception of a message that requests to establish a bearer between a cellular core network of the cellular network and the cellular access network from the cellular core network, wherein the message that requests to establish a bearer between the cellular core network and the cellular access network is transmitted by the cellular core network to the cellular access network upon reception (S 1101) of service data from a MTC server, and the dual mode gateway is a device connecting a cellular network and a capillary communication network having an independent topological structure and being different from the cellular network and comprising a capillary network device to which the service data is destined; determining, by the dual mode gateway, whether itself is congested, and returning, by the dual mode gateway, to the cellular access network, a message that responds to establishing a wireless air interface bearer between the cellular access network and the dual mode gateway, wherein the message that responds to establishing a wireless air interface bearer between the cellular access network and the dual mode gateway comprises a delay transmission message which causes a delay in the transmission of the service data to the dual mode gateway if the dual mode gateway is congested at that time, wherein the delay transmission message comprises a reaccess time evaluated for the service data by the dual mode gateway, and the dual mode gateway being congested is due to the capillary network device falling in sleep; and transmitting, by the cellular access network, to the cellular core network a message that responds to establishing a bearer between the cellular core network and the cellular access network, wherein the message that responds to establishing a bearer between the cellular core network and the cellular access network is received and analyzed by the cellular core network, and the transmission of the service data to the dual mode gateway is delayed by the cellular core network, if the message that responds to establishing a bearer between the cellular core network and the cellular access network comprises a delay transmission message, wherein the time for delaying the transmission of the service data to the dual mode gateway is the reaccess time contained in the delay transmission message. transmitting, by a cellular access network of a cellular network, to a dual mode gateway a message that requests to establish a wireless air interface bearer between the cellular access network and the dual mode gateway, upon reception of a message that requests to establish a bearer between a cellular core network of the cellular network and the cellular access network from the cellular core network, wherein the message that requests to establish a bearer between the cellular core network and the cellular access network is transmitted by the cellular core network to the cellular access network upon reception (S 1101) of service data from a MTC server, and the dual mode gateway is a device connecting a cellular network and a capillary communication network having an independent topological structure and being different from the cellular network and comprising a capillary network device to which the service data is destined; determining, by the dual mode gateway, whether itself is congested, and returning, by the dual mode gateway, to the cellular access network, a message that responds to establishing a wireless air interface bearer between the cellular access network and the dual mode gateway, wherein the message that responds to establishing a wireless air interface bearer between the cellular access network and the dual mode gateway comprises a delay transmission message which causes a delay in the transmission of the service data to the dual mode gateway if the dual mode gateway is congested at that time, wherein the delay transmission message comprises a reaccess time evaluated for the service data by the dual mode gateway, and the dual mode gateway being congested is due to the capillary network device falling in sleep; and transmitting, by the cellular access network, to the cellular core network a message that responds to establishing a bearer between the cellular core network and the cellular access network, wherein the message that responds to establishing a bearer between the cellular core network and the cellular access network is received and analyzed by the cellular core network, and the transmission of the service data to the dual mode gateway is delayed by the cellular core network, if the message that responds to establishing a bearer between the cellular core network and the cellular access network comprises a delay transmission message, wherein the time for delaying the transmission of the service data to the dual mode gateway is the reaccess time contained in the delay transmission message.