This article is based on the on-site review data of qualification certification for inspection and testing institutions in Beijing from 2020 to 2022, and statistically analyzes the non conformities found in the past three years of review. It sorts out the clauses with many non conformities found in the on-site review, discusses the compliant behaviors and practices of these clauses, and provides suggestions. The aim is to help inspection and testing institutions continuously improve and promote the service capacity of the inspection and testing industry Improvement of technical ability and management level.