As an important indicator of the power supply side,the level of electricity business environment has become the direction and guidance for the company to innovate the service mode and enhance comprehensive competitiveness. The difficulties faced by optimizing the electricity business environment in China is studied,and service quality of power installation for small and medium the measures taken by electric power companies to improve the-sized customers are reviewed and summarized. Referring to the practical experience of power installation for large customers in advanced regions, some suggestions on further optimizing the electricity business environment are put forward from the aspects of service system,policy support, power grid construction, investment mode and power supply reliability.