A method and system for accessing to a network through public equipment are provided. The method includes: after an access service node (ASN) receives a network access request message from a user on public equipment, the ASN sending the network access request message to an authentication center (AC), wherein, the network access request message comprises at least the user's account and password; the AC verifying validity of the account and the password, if the verification is passed, sending the user's access identifier (AID) to the ASN; and after the ASN receives the user's AID, the ASN sending the user's AID to the public equipment, the public equipment taking the user's AID as a virtual AID and using the virtual AID to send and receive user's messages. By the present invention, users who access to the network through the public equipment can be tracked and traced effectively.