The invention discloses a distribution automation system, which comprise a master station layer, a substation layer and a terminal layer, wherein the substation layer is connected with the master station layer through an SDH optical fiber communication network; and the terminal layer is connected with the substation layer through optical fibers, the terminal layer comprises a communication terminal which is connected with a distribution transformer terminal in an Ethernet, wireless or carrier communication mode. The terminal layer further comprises a wireless base station and wireless terminals, wherein the wireless base station is connected with the communication terminal through an Ethernet port; and the wireless terminals are connected with the wireless base station in a wireless communication mode, and each wireless terminal is connected with the distribution transformer terminal through an Ethernet port. The network architecture construction distribution automation communication network supplemented by a wireless communication or carrier communication mode provides technical support and guarantee for safe and stable operations of a distribution network load.