An establishment method for a link between an access point and a repeater in a wireless distribution system, comprising the following steps: starting the access point and the repeater in the wireless distribution system; the access point and the repeater transmitting an interactive message to each other, and obtaining channel information, channel encryption mode, cipher key information, and address information of an opposite end about the link between the access point and the repeater from the interactive message; the access point and the repeater establishing the link between the access point and the repeater according to the channel information, the channel encryption mode, the cipher key information, and the address information of the opposite end; wherein the access point and the repeater transmitting the interactive message to each other, and obtaining the channel information about the link between the access point and the repeater from the interactive message comprises: the repeater transmitting an exploration broadcast message, wherein the exploration broadcast message comprises capability information of the repeater; and the access point transmitting an exploration response message if the access point receives the exploration broadcast message within a first allowed time, wherein the exploration response message comprises the channel information; the access point and the repeater transmitting the interactive message to each other, and obtaining the channel encryption mode and the cipher key information from the interactive message comprises: after the repeater receives the exploration response message, the repeater transmitting a link request message to the access point by using the channel; the access point comparing the number of wireless distribution system links which have been established with a maximum value of allowable links if the access point receives the link request message within the first allowed time; if the number of the wireless distribution system links which have been established is less than the maximum value of the allowable links, the access point transmitting a link success message, wherein the link success message comprises the channel encryption mode and the cipher key information; the repeater receiving the link success message and transmitting an authentication request message according to the encryption information; the access point performing authentication on the repeater if the access point receives the authentication request message within a second allowed time; and if the authentication is successful, the access point transmitting an authentication success message. starting the access point and the repeater in the wireless distribution system; the access point and the repeater transmitting an interactive message to each other, and obtaining channel information, channel encryption mode, cipher key information, and address information of an opposite end about the link between the access point and the repeater from the interactive message; the access point and the repeater establishing the link between the access point and the repeater according to the channel information, the channel encryption mode, the cipher key information, and the address information of the opposite end; wherein the access point and the repeater transmitting the interactive message to each other, and obtaining the channel information about the link between the access point and the repeater from the interactive message comprises: the repeater transmitting an exploration broadcast message, wherein the exploration broadcast message comprises capability information of the repeater; and the access point transmitting an exploration response message if the access point receives the exploration broadcast message within a first allowed time, wherein the exploration response message comprises the channel information; the access point and the repeater transmitting the interactive message to each other, and obtaining the channel encryption mode and the cipher key information from the interactive message comprises: after the repeater receives the exploration response message, the repeater transmitting a link request message to the access point by using the channel; the access point comparing the number of wireless distribution system links which have been established with a maximum value of allowable links if the access point receives the link request message within the first allowed time; if the number of the wireless distribution system links which have been established is less than the maximum value of the allowable links, the access point transmitting a link success message, wherein the link success message comprises the channel encryption mode and the cipher key information; the repeater receiving the link success message and transmitting an authentication request message according to the encryption information; the access point performing authentication on the repeater if the access point receives the authentication request message within a second allowed time; and if the authentication is successful, the access point transmitting an authentication success message.