In order to satisfy the requirements of energy saving and process adjustment in oil field,the frequency converters and other non-linear power electronic equipments are widely used,and the harmonic pollution of oil field distribution network is raising serious.The harmonic on-line monitoring system lays a foundation for measuring and analyzing the harmonic distribution characteristics of oil field power distribution network.However,due to the economic constraints of application,the installation quantity of harmonic measuring terminal is limited,so it is necessary to optimize its installation position.Considering both the observability and the redundancy of harmonic state estimation,a method for the optimization of measuring terminal addressing is proposed.The observability and redundancy of the system under different harmonic measurement terminal configurations are calculated by using node correlation matrix and observability logic judgment method of harmonic state estimation.On the premise of ensuring the maximum observability of the system,the installation position of the measuring terminal is optimized with the maximum redundancy.In the case of limited number of terminals,the considerable measure and precision of harmonic state estimation of oilfield power distribution network can be improved.Simulation results show that the method is effective.