For post-doctors who need to delay their station retreat due to work, they should submit the application report two months before the contract deadline. The application should be approved by the supervisor and the postdoctoral work leading group of the School of Medicine. The application then needs to be submitted to the Doctoral Management Office of the University for approval. Post-doctoral students should log in to the info system through the online management and service platform. The access path is: log in to the Tsinghua University information portal - Comprehensive - personnel - post-doctoral online management and service platform.