Method and system for selecting signal channel in wireless local area network

The invention discloses a method and a system for selecting a signal channel in a wireless local area network (WLAN). The method for selecting the signal channel in the wireless local area network includes that when data transmission is needed, a sending station consults with a receiving station to confirm a viable signal channel according to more than one parameter vector set for indicating the signal channel use state of each of them. By means of the method and the system for selecting the signal channel in the wireless local area network, the signal channel resource is effectively used.