This paper presents a method of optimizing distribution networks based on the total supply capability（TSC）. Firstly，this paper defines the optimal construction order of feeder links.Secondly，a mathematical model of optimal construction order of feeder links is proposed which is simplified depending on actual circumstances.Finally，based on the balance degree，the optimal position of feeder links and the method of calculating the optimal scale of feeder links are given. The process of optimal construction orders is summarized.The advantages of the method proposed are verified by test on an actual system.