The allocation of the number and location of distribution terminal of distribution network power supply has an important influence on the reliability and economy, the rational allocation of power distribution terminal is conducive to promoting the economic efficiency of distribution automation construction. In order to ensure the reliability of power supply under the premise, to solve the problem of high investment in distribution automation distribution network configuration for the blind "three remote" terminal, put forward a comprehensive consideration of the reliability and economy of distribution terminal optimization methods. The method established a comprehensive cost minimum as the goal of the optimization mathematical model of distribution automation terminal, and are solved using implicit enumeration method. This method is applied to an example of an overhead multi segmented single contact power grid, The results show that the method is correct and practical.