Abstract-Today by more complicating in smart grid, request and need for reliability, security and more efficiency and also environmental concerns, we need to change the operation and use of electrical networks. Power companies and the government consider that the smart grid will be salvation for the future. Recent advances in the fabrication of integrated circuits and the development of wireless communication technology that is cusses WSN entry in smart grid. One of the most important features of sensor networks used in smart grid is the energy constraints. So we will offer a new architecture for smart grid in the field of the WSNs to reduce the total energy. Moreover, we will improve some routing factors, QoS parameters such as delay and reliability with respect to the desired user.Index Terms-Smart grid, wireless sensor network, sectoring, minimum spanning tree.