With our grain quality supervision and testing work being promoted to a new period of development, China has paying the continuous attention to the quality and safety of grain and oil, and the requirements for grain and oil safety and quality testing laboratories are becoming gradually higher. Because of the testing process complexity, the high requirement on professional and technical level, and the wide range of grain and oil to be tested, we require more strictly on the ability of laboratories. This paper introduces the CNAS accreditation of grain and oil testing laboratories in China, focusing on the analysis of the requirement on the structure, resources, process and management system about the grain and oil test laboratory in CL01:2018《Accreditation criteria for the competence of testing and calibration laboratories》(ISO/IEC 17025: 2017). Based on CNAS laboratory accreditation, we propose suggestions for the construction of grain and oil testing system, in order to help the grain and oil testing laboratories improve grain and oil safety and quality testing management system.