The invention discloses a communication method comprising the steps as follows: an access point receives a sending request sent by a first site, and sends sending permission information to the first site; and when the access point receives feedback information sent by the first site, the access point distributes a channel to the first site, distributes the channel to a second site according to residual bandwidth, generates a first triggering frame, respectively sends the first triggering frame to the first site and the second site, and receives uplink data sent by the first site and the second site. The invention also provides the access point and the site can implement the communication method. According to the method provided by the invention, a bandwidth utilization rate of the access point can be improved, and data transmission efficiency can also be improved.