The invention relates to a method for finishing the network access of a mobile subscriber by utilizing a computer communication system, in particular to a computer-communication-system-based online self-service network access method for a mobile telephone number of a client terminal. A subscriber identity module (SIM) card only solid-storing an identification code is provided; and then a mobile client takes own communication equipment as the client terminal, logs on a computer-based mobile service support system of a mobile operator or a channel system through the computer communication system to select the number and a pricing package, activates the number and opens an account. The method has the advantages that: the production, manufacturing, selling and management procedures of the SIM card are simplified; the management cost and running cost of the mobile operator and the channel system are decreased, and funding pressure is decreased; and the number selection range is expanded for the mobile client, time and energy are saved, the number is more flexibly and conveniently selected, and the method is more flexibly and conveniently used.