Abstract: Microgrid is an important means for enterprises to use green energy in the petrochemical industry, and it is also an important carrier for achieving the "dual carbon" goal. There are planning elements and optimization issues related to the stable integration of fluctuating new energy sources, integrated scheduling of new and old power sources, fault ride through and protection mechanisms. First, the typical microgrid architecture and characteristics and the design principles based on the constraint of stable operation of petrochemical load are analyzed. Second, the microgrid planning optimization, "source grid load storage" configuration, collaborative scheduling are studied and analyzed. Third, from the perspective of users, the control and protection issues of microgrids are discussed. Finally, a case study of a microgrid in a certain enterprise is introduced, the design and application experience of microgrids in petrochemical scenarios are summarized and analyzed. The ultimate goal is to promote the application of green electricity and overall quality and efficiency improvement in the petrochemical industry.