The distribution system establishes the relationship between the transmission system and the consumer and it is the closest part of the power system to the consumer. Due to increasing demand for electricity, environmental constraints and competition in the energy supply market, transmission and distribution systems often operate under heavy load conditions. Severe voltage drops, multiple blackouts and high losses are major problems in distribution networks. Reconfiguration is the simplest and least costly way to meet the above goals relatively. In this study, the Reconfiguration of distribution networks is presented as an optimization problem. An objective function including active power loss indices and voltage profiles is introduced. Various scenarios have been introduced to examine this approach. To solve this problem, the Imperialist Competition Optimization (ICA) algorithm is used in Matlab software environment. Simulation results on IEEE standard radial distribution systems 33, 69 and 118 show that optimizing the opening and closing position of the switches will greatly improve the performance of the distribution system.