The embodiment of the invention discloses a reference flow selecting method and a device, which relates to the field of communication technology; the reference flow selecting method and the device can ensure the whole data transmission course more stable, and avoids wasting each chance of sending data. The disclosed methods of the embodiment of the invention are as follows: a first logic signal channel which has the highest priority and data sending is selected from all the logic signal channels; the first logic signal channel is judged to decide whether the flow mapped by the first logic signal channel can be selected as the reference flow; under the circumstances that the flow mapped by the first logic signal channel is judged to be not selected as the reference flow, a second logic signal channel which has the highest priority and data sending is sequentially selected from the rest logic signal channel, and the second logic signal channel is judged until the reference flow is selected. The invention is the enhanced scheme of the existing reference flow selection.