Power system consists of three parts: the generating system, transmission system and distribution system. In general, the distribution system is running in the radial structure. The electrical energy is generated from power plants through the transfer of the transformer and transmission feeder assigned to each customer. Distribution system is the most downstream of the power system and covers a vast level. Distribution system transmits power energy from the main substation to secondary substation transformers, feeders, branch line and the customers. Due to the feeder line, and the meter, and so on, thess facts will resul in line losses, and also reduce the efficiency of system operation. Installation of various types of switches in the distribution system to facilitate management, how to determine the distribution system switching operation strategy to achieve the desired voltage, to reduce energy losses and to enhance the system spinning reserve capacity are the subject of an extremely worthy of attention. This thesis presents the heuristic rule base to solve the decision problem of the distribution system on switching operation. The power distribution system is using radial structure with feeder-line setting section switch to the feeder for dividing into several sections, so as to minimize the fault area. The feeder is set between the normally open contact switch connected to each other, when a feeder of an accident or for maintenance, continue to supply electricity via other feeders. The distribution network is very large and complex, so how to properly operate the feeder line set these switches, leaving the distribution system in the multiple goals of safe, reliable and economic operation, the power companies have been received considerable attention. Usually the decision problem of the distribution system operation includes: how to recover the largest power outage area load to increase the reliability of power supply? How to determine the minimum number of switching operations to reduce operating costs? How to maintain a minimum amount of voltage variation to improve power quality? How to reduce the feeder current transformer load to reduce the energy losses? How to maintain a radial network structure to meet the operational limitations? How to determine the switching operation to ensure the safety of operations? This dissertation considers the practice of the distribution power system to develop a new mathematical model so that it can meet the practical situation of the power system. It is a key point of the safe and economic distribution to control sectionalizing switches, tie switches and breakers for minimizing faults, area of uncharge and power losses. This work will develop an expert system to aid distribution operation by an artificial intelligent approach. There are two goals in this project. First, the expert system will select suitable isolation points to limit the fault area. Then, it will propose restoration planning. Second, in normal system opertion, it is essential to make the loads on feeders and main transformers as balanced as possible.