A new round of electric power system reform is underway with the release of“Several opinions on further deepening the reform of the electric power system”and its supporting documents. The new reform will liberalize the electricity selling market and encourage social capital to establish electricity selling company. Those companies can buy electricity from power generation companies and sell electricity to users. As a traditional power supply service provider and power seller, it is the responsibility and obligation for grid companies to provide efficient and convenient services to all power selling entities, promote market competition and ensure the smooth progress of power reform. In order to better implement the document requirements, the functional requirements analysis of market oriented customer relationship business in the market based electricity power selling system is analyzed,the business, application and data architecture of the platform are introduced. It is believed that the technical supports have been provided in terms of setting up electricity selling company files and relations between power users and electricity selling companies.