Abstract: The application of the flexible DC loop network controller can be used to solve the problems that the distribution network can’t continue to run under the looped operation and improve the reliability of power supply. The location model based on the “primary screen- fine screen” mode is established by means of decoupling the locating and sizing issues in order to solve the locating and sizing NP-hard problems of the flexible DC loop network controller in this paper. The model is central with power supply reliability and taking into account of the supply capacity and economic through entropy and ideal point analysis manner for comprehensive assessment program optimization. The sizing model is established based on net load and feeder capacity carrying out the life cycle management of assets concept, and three kinds of applicable sizing methods applied in different stages of development grid are studied based on the analysis of different stages of development characteristics of the grid. The scientific and engineering practicality of this model is showed through the analysis of a demonstration area.