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¹Ø¼ü´Ê£º×¡Õ¬Ð¡Çø£¬¹©µçÏß·£¬¸ººÉ¼ÆË㣬±äѹÆ÷£¬¶Ì·µçÁ÷ Abstrcat With speeding up the pace of china¡¯s overall well-off society and rapid development of urban construction and residential quarters, at present residential districts are wildly popular with people in large and medium-sized cities, which have replace the main streets of the past living form and in a large, intelligent and multi-function of the direction of development. As the economic development, the requirements to electricity of the residents will become stricter. The simple supply of lighting has become history, and improvement of the living environment of electricity is emerging. Moreover, the informationization of modern society and networking are building on the basis of electrification. Therefore, the designation of electric power distribution not only to achieve the safety, reliability, and should be forward-looking, fully reflected in its economic and sustainable development. The design specification takes the power distribution of Dongtou economically affordable housing as the main body, identifying their specific power supply system and simple introducing of the relay protection and ground protection. According to China¡¯s distribution and various standards of transformers, switchgears, circuit and other electrical equipment, to choose the specific quantitative electrical equipment and finally come to the road map of power supply system. KEY WORDS:residential districts£¬the power distribution£¬transformers£¬relay protection