This application discloses a traffic shaping method, where the method is applied to a wireless communication time division duplex (TDD) mode. A network device obtains N data packets sent by a terminal device using a shaping layer, where N is an integer greater than 0, the N data packets are submitted in sequence, and the shaping layer is configured to sort the N data packets; the network device compares traffic of the N data packets or a time interval at which the shaping layer sends data packets with a preset value when the network device determines that none of the N data packets is lost or that the N data packets are not out of order; and the network device shapes the traffic based on a comparison result by using the shaping layer.