The invention discloses a method and a system for displaying virtual private mobile network (VPMN) user short numbers in a call assistant service. The method comprises the steps: dialing the user short numbers of the call assistant service through a VPMN user; triggering the call to a service control point (SCP) through a calling mobile switching center (MSC), building a connection between calling and called terminals according to the returned calling and called long numbers from the SCP, moreover, carrying out signaling acquisition on the SCP so as to obtain the calling and called long and short numbers, and storing the calling and called long and short numbers in a short number log sheet; and when the called terminal is turned off or cannot transfer the call, transferring the call to the call assistant platform through the calling MSC, and when the called terminal is turned on or returns to a service area, searching the short number log sheet of the call through the call assistant platform, and sending call assistant prompt messages to the calling or called terminal in a short number mode in the short number log sheet. The method belongs to the technical field of network communication; and when the VPMN user calls the call assistant service user through using the short numbers, call assistant prompt messages can be sent to the calling and called terminals in the short number mode.