Sample selection should pay attention to the following points: (1) Multi-site sampling of representative. When an enterprise has several similar site, to have similar hazards and under the same administrative body control operation can be performed on-site audit sampling. The site should be run under a common management system Yan'an HSE certification, the implementation of internal audit, and a unified management review. 7. Prepared system documents HSE management system is a set of document management systems and methods HSE certification bodies, so Ordos HSE certification, preparation of system files are enterprises established HSE management system indispensable element, is to establish and maintain HSE management system is important foundation work , but also to achieve the desired HSE corporate policy, evaluate and improve the HSE management system, continuous improvement and an essential basis for accident prevention. Yan'an HSE certification _ China Certified Technology Specialist (certified) _HSE certification provided by the Chinese Certified Technology Specialist studio. China Certified Technology Specialist studio (www.zgrzzj.cn) is Xi'an, advice, research leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Certified Technology Specialist in Chinese leadership with the staff warmly welcome all inquiries negotiations to create a Chinese Certified Technology Specialist better future.