Business expansion is an important work in the marketing and distribution management of power supply enterprises, it is of great significance for forming and maintaining a good distribution network structure, ensuring the power supply reliability of the distribution network and improving the utilization efficiency of the distribution network resources. With the development of information technology and marketing information system, the process of business expansion is gradually improved. A fuzzy multi-objective optimization function is proposed to further improve the precision of the current low-voltage user industry, and the target function is used to evaluate the expansion of the low voltage user industry, then the optimal access scheme is determined according to the results of the evaluation. This method can reduce the three phase unbalance and line loss rate of the platform and improve the economy of the operation of the distribution network. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900101) and Science and Technology Project of State Grid Corporation of China (No. SC-2016-015).