Abstract: Aiming at the problem of Oracle 12C RAC cluster node damage under Windows platform, the scheme research and implementation were carried out. Through in-depth study of Oracle RAC's principle and scalability characteristics, consulting Oracle technical documents from various sources, various problems in the implementation process were successfully solved. Finally, under the condition of continuous cluster and business continuity, the original cluster architecture was restored online, and the high availability of the core system was guaranteed, which accumulated valuable experience for the operation and maintenance of database system under Windows platform.