To standardize and improve the quality of reporting of patient and public involvement in health and social care research, BMJ recently published the 2nd edition of Guidance for Reporting Involvement of Patients and the Public (GRIPP 2). This paper introduces the background and process of GRIPP 2 development, and explains the core content of GRIPP 2. It is expected that GRIPP 2 will provide reference for domestic researchers carrying out patients and public involvement (PPI) research and writing PPI research report.