Provided are a method and device for sending information. The method for sending information of the present invention comprises: before a sending station sends data, detecting a busy or idle condition of a channel; if the channel is in an idle state, increasing, by the sending station, the maximum time length for occupying the channel, and sending data, wherein the time length for occupying the channel when the data is sent is less than or equal to the increased maximum time length; and if the channel is in a busy state, reducing, by the sending station, the maximum time length for occupying the channel, and sending data, wherein the time length for occupying the channel when the data is sent is less than or equal to the reduced maximum time length.