By analysis of the definition and operation program of internal examination and verification requested in GB / T 19001-2000 quality management system, the article elaborates the key link, main point, method and the importance of internal examination and verification. 分析了GB/T19001&2000质量管理体系要求中有关内部审核的定义和操作程序,并阐述内审中的关键环节、要点、方法及重要作用。