The invention discloses a method for a mobile terminal to access a network. The method comprises the following steps that S1, the mobile terminal is connected with a computer in a wireless or wired mode; S2, the computer obtains an identity of the mobile terminal and reads a record of the identity of the mobile terminal; and S3, the computer judges the identity, if the identity is recorded in thecomputer, a step S4 is turned to, if the identity is not recorded into the computer, the computer sends out prompt of an unknown mobile terminal, when a user selects rejection, the computer does not allow access of the unknown mobile terminal, when the user selects acceptation, the record of the identity is increased by 1, the expressed record is changed from 0 to 1, and the computer allows the mobile terminal to access the computer and does not allow the mobile terminal to carry out write operation on the computer.