Abstract: In order to study the expansion characteristics and layout methods of the commercial network of sharing economy, the positive and negative network effects that affect the development of the commercial network of sharing economy are taken into account, constructs the cost and revenue model of the commercial network of sharing economy are constructed, and the profit characteristics of all kinds of networks is analyzed step by step. On the above analysis, the sharing economy business networks are divided into six categories, and the two-step difference clustering-firefly algorithm for sharing economy business network layout is proposed. It is found that the comprehensive influence of positive and negative network effect makes the sharing points present different profit-development characteristics, and the layout order of different types of sharing points will have an impact on the profit of the whole network. The two-step difference clustering-firefly algorithm can not only improve the efficiency and accuracy of the early search, but also can conveniently recognize the layout order of the candidate sharing points by classifying the candidate nodes.

Key words: sharing economic, network effect, renting point, two-step difference clustering-firefly algorithm