Abstarct: Electric vehicles and hybrid vehicles are inseparable instruments human life in the future that Due to the high efficiency and reduce greenhouse gas emissions, are being developed day-to-day. But their Uncoordinated connection to the power grid causes extremely undesirable impact on the network, Such as exceeding voltage of permissible bound , increasing losses and heavily loading network that may collapse it. This case indicates necessity of planning in joining vehicles. Therefore the purpose of this Thesis is to reduce losses and increase network efficiency, level load curve and maintain voltage range to avoid network collapse. This program runs offline and Usess mathematical, accurate response in order to reduce losses with respect to providing equality for all consumers. For this purpose, be used the forward backward sweep method and prioritize consumers in three different time periods, peak, average and free in different PEVs penetration. In order to investigate variety conditions of vehicle connections is needed to consider percentage for penetration vehicle.