A wireless local area network, WLAN, access method, wherein the method is performed by a system comprising a base station controller of a base station serving a user equipment, the user equipment, an access access point, access AP, and a core network, the method comprising: a.) sending, by the base station controller, information about a third AP set to the user equipment, wherein the third AP set comprises at least one AP, and the information about the third AP set comprises identifier information of the at least one AP in the third AP set (step 301); b.) determining, by the user equipment, a second AP set according to the information about the third AP set, wherein the second AP set comprises at least one AP; c.) sending, by the user equipment, WLAN access information for requesting WLAN access to the base station controller, wherein the WLAN access information comprises information about the second AP set, and the information about the second AP set comprises identifier information of the at least one AP in the second AP set (step 302); d.) determining, by the base station controller, a first AP set according to the information about the second AP set, wherein the first AP set comprises at least one AP (step 303); e.) sending, by the user equipment, a service request to the core network or sending, by the base station controller, an authentication request to the core network, so as to trigger the core network to perform an identity authentication process for the user equipment (step 304); f.) receiving, by the base station controller, an authentication success message sent by the core network (step 305); g.) after the reception of the authentication success message by the base station controller, sending, by the base station controller, information about the first AP set to the user equipment, wherein the information about the first AP set comprises identifier information of the at least one AP in the first AP set (step 306); h.) determining, by the user equipment, from the first AP set the access AP for accessing the WLAN according to the received information about the first AP set (step 307); i.) when the user equipment accesses the access AP, sending, by the user equipment, an access success message to the base station controller or when the access AP detects that the user equipment accesses it, sending, by the access AP, the access success message to the base station controller, wherein the access success message is used to notify the base station controller that the user equipment successfully accesses the WLAN by using the access AP (step 308). a.) sending, by the base station controller, information about a third AP set to the user equipment, wherein the third AP set comprises at least one AP, and the information about the third AP set comprises identifier information of the at least one AP in the third AP set (step 301); b.) determining, by the user equipment, a second AP set according to the information about the third AP set, wherein the second AP set comprises at least one AP; c.) sending, by the user equipment, WLAN access information for requesting WLAN access to the base station controller, wherein the WLAN access information comprises information about the second AP set, and the information about the second AP set comprises identifier information of the at least one AP in the second AP set (step 302); d.) determining, by the base station controller, a first AP set according to the information about the second AP set, wherein the first AP set comprises at least one AP (step 303); e.) sending, by the user equipment, a service request to the core network or sending, by the base station controller, an authentication request to the core network, so as to trigger the core network to perform an identity authentication process for the user equipment (step 304); f.) receiving, by the base station controller, an authentication success message sent by the core network (step 305); g.) after the reception of the authentication success message by the base station controller, sending, by the base station controller, information about the first AP set to the user equipment, wherein the information about the first AP set comprises identifier information of the at least one AP in the first AP set (step 306); h.) determining, by the user equipment, from the first AP set the access AP for accessing the WLAN according to the received information about the first AP set (step 307); i.) when the user equipment accesses the access AP, sending, by the user equipment, an access success message to the base station controller or when the access AP detects that the user equipment accesses it, sending, by the access AP, the access success message to the base station controller, wherein the access success message is used to notify the base station controller that the user equipment successfully accesses the WLAN by using the access AP (step 308).