A data transmission method is provided. The method includes: a base station detecting a preset frequency band, and determining whether an idle for a first length of time exists in a predetermined period of time in a subframe p of the preset frequency band; and if the idle for the first length of time is detected, the base station scheduling data on N consecutive subframes starting from a following subframe of the subframe p and transmitting the data, and setting last A symbols in the last one among the N consecutive subframes to be idle, N and A being both positive integers.