This disclosure provides a method and for determining WLAN channel in a base station which supports both WLAN access and cellular network access, and a first WLAN channel is allocated for its WLAN access. According to this disclosure, if frequency space between the first WLAN channel and frequency range occupied by the cellular network access is not larger than a threshold, the base station detects available WLAN channels which are not occupied by surrounding WLANs. If the frequency space between the available WLAN channels and the frequency range occupied by the cellular network is not larger than the threshold, the base station changes its WLAN channel from the first WLAN channel to a second WLAN channel occupied by one of the surrounding WLANs. The frequency space between the second WLAN channel and the frequency range occupied by the cellular network access is larger than the threshold, thus interference between the cellular network and the WLAN is reduced or eliminated. This disclosure also provides a base station.