The present invention relates to a mobile operation terminal system used in an electric power site. A global position system (GPS) is arranged on a mobile operation terminal to position the geographic position of the mobile operation terminal under the control of a control unit and send the geographic position information to a packaging unit, the packaging unit packages and transmits the geographic position information and a power device parameter which is obtained at the geographic position together, and after receiving the data, a server can find a power device at the position according to the geographic position information in the packaged data, and stores the received power device parameter in a table of the power device. When the power device parameter is recorded in the mobile operation terminal, the information, such as the name of the power device, etc., does not need to be recorded. The server corresponds to the corresponding power device rapidly according to the geographic position information, thereby reducing the workload of the on-site inspection personnel. In addition, the power device is determined according to the geographic position information, so that the determination of the power device is more objective, the acquisition of the device parameter is more accurate, and the usage effect is good.