The invention relates to a method based on the client module of a mobile terminal for realizing the real name call service, which is characterized in that a client side software module is positioned at a mobile terminal; when in use each time, the software module is started first; then the real name to be called is input into the screen and is clicked in order to confirm; the phone number corresponding to the real time is searched by the software module in the database of the mobile terminal according to the real name; the phone number is called directly if the search succeeds; if the search fails, the real time is encoded according to the user-defined message protocol format, which is sent to an address book server on one side of the network; the corresponding phone number is continually searched by the server; the searched result is encoded according to the protocol, which is returned to the software module in order to be decoded; then the phone number is retrieved and called; if the search fails, the failure information of the call is returned to the software module; finally, the flow is completed. The invention has the advantages of convenient and simple operation; in addition, the technical problems of circuitous phone line and expensive communication expenses of the prior art in the process of realizing real time call service can be overcome.