Disclosed is a method for transmitting service data to wireless local area network (WLAN) users. A service notification unit is set in the network for use in transmitting service access notices to WLAN users. After accessing the network, a WLAN user terminal immediately establishes a continuous connection between itself and the network as a common channel for transmitting service access notices. Before a service serving unit transmits service data to a WLAN user terminal that has no direct connection with the serving unit, the method further includes the service serving unit sending a service access notice to the service notification unit. The method still further includes, after receiving the service access notice, the service notification unit inquiring and acquiring the routing information of the established common channel, and sending the service access notice to the WLAN user terminal via the established common channel in accordance with the acquired routing information. Service access notices can then be sent to user terminals when the user terminals have no direct connections with the service to be accessed.