Purpose/Significance To provide more scientific and unified assessment standards for clinical research and meta-analysis, in order to improve the quality of medical evidence.Method/Process 390 duplicate records of bias risk assessment are retrieved and screened out from CNKI. These records are analyzed from three aspects:overall result consistency, thematic and content consistency, and indicator consistency.Result/Conclusion Over 80% of the groups have inconsistent risk assessments for the same randomized controlled trial. In terms of subject content, there is a high consistency in research on contagious diseases and infectious diseases, endocrine glands and systemic diseases.The Kappa coefficient of traditional Chinese medicine is widely distributed, and there are significant differences in the consistency of risk assessment. In terms of indicators, there are significant differences in selective reporting, completeness of outcome data, and other biases.