Distribution network automation terminals can speed up fault location and isolation, and improve power supply reliability, but how to configure the terminals reasonably and economically is one of the current difficulties. In order to solve the above problems, this article considers the role of multiple types of automated terminals in fault handling, and innovatively builds a function of the outage time of the load related to the terminal configuration by building the fault-induced load, and then builds an optimization model for the terminal configuration, which fully considers Economical in the terminal configuration process, and accelerate the efficiency of the solution through improve island parallel computing. Finally, the results of the RBT-BUS4 calculation example prove that the optimization model proposed in this paper can not only ensure the reliability of power supply but also take into account the investment economy, and has a good engineering application prospect.