The present invention discloses a traffic control-based data transmission method, a traffic control-based switch, a node server and a traffic control-based communication system, thereby solving the problem that the quality of network transmission cannot be guaranteed in the present IP network. The method comprises: obtaining, by a switch, the traffic control information for each service request, wherein the traffic control information includes sending time interval and sending data size; receiving, by the switch, a data packet, and putting it into a packet buffer queue; and polling, by the switch, the packet buffer queue, and taking a packet from the packet buffer queue for sending according to the traffic control information. The present invention can realize accurate traffic control, it is applicable for multimedia transmission, and it can guarantee transmission quality.