A wireless local area network authentication method, comprising: automatically obtaining, by a mobile terminal, a local phone number stored in the mobile terminal and sending, via the wireless local area network, to a network server, a dynamic password request that carries the local phone number; returning, by the network server, via a mobile network, a short message to the mobile terminal that carries a dynamic password as access password; automatically obtaining, by the mobile terminal, an access account and an access password; and automatically sending, by the mobile terminal, a WEB authentication request to a network server, wherein the WEB authentication request carries the access account and the access password; wherein if the short message does not further carry a dynamic account, the automatically obtaining, by the mobile terminal, the access account and the access password comprises: obtaining, by the mobile terminal, the local phone number stored in the mobile terminal, to use the local phone number as the access account; and obtaining, by the mobile terminal, the dynamic password carried in the short message, to use the dynamic password as the access password; wherein if the short message further carries a dynamic account, the automatically obtaining, by the mobile terminal, the access account and the access password comprises: obtaining, by the mobile terminal, the dynamic account carried in the short message, to use the dynamic account as the access account; and obtaining, by the mobile terminal, the dynamic password carried in the short message, to use the dynamic password as the access password. automatically obtaining, by a mobile terminal, a local phone number stored in the mobile terminal and sending, via the wireless local area network, to a network server, a dynamic password request that carries the local phone number; returning, by the network server, via a mobile network, a short message to the mobile terminal that carries a dynamic password as access password; automatically obtaining, by the mobile terminal, an access account and an access password; and automatically sending, by the mobile terminal, a WEB authentication request to a network server, wherein the WEB authentication request carries the access account and the access password; wherein if the short message does not further carry a dynamic account, the automatically obtaining, by the mobile terminal, the access account and the access password comprises: obtaining, by the mobile terminal, the local phone number stored in the mobile terminal, to use the local phone number as the access account; and obtaining, by the mobile terminal, the dynamic password carried in the short message, to use the dynamic password as the access password; wherein if the short message further carries a dynamic account, the automatically obtaining, by the mobile terminal, the access account and the access password comprises: obtaining, by the mobile terminal, the dynamic account carried in the short message, to use the dynamic account as the access account; and obtaining, by the mobile terminal, the dynamic password carried in the short message, to use the dynamic password as the access password. obtaining, by the mobile terminal, the local phone number stored in the mobile terminal, to use the local phone number as the access account; and obtaining, by the mobile terminal, the dynamic password carried in the short message, to use the dynamic password as the access password; wherein if the short message further carries a dynamic account, the automatically obtaining, by the mobile terminal, the access account and the access password comprises: obtaining, by the mobile terminal, the dynamic account carried in the short message, to use the dynamic account as the access account; and obtaining, by the mobile terminal, the dynamic password carried in the short message, to use the dynamic password as the access password.