The present invention discloses a WiFi access system, which collects a list of WiFi access points around a mobile terminal, and determines a final location of the mobile terminal based on a positioning information of each of the WiFi access points, positioning information of a base station, and satellite positioning information; a cloud server sends password information of each available WiFi access point to the mobile terminal according to sorting result of the list of WiFi access points based on degree of accessing difficulty of the mobile terminal and the final location information of the mobile terminal, in combination with an identification code, a password, and a geographic position of each of the WiFi access points locally stored, so that the mobile terminal can conveniently access the corresponding available WiFi access points.