The audit was launched in January 2020. After nearly a week of preliminary and reexamination, experts from Beijing Tianyi Certification Center, in strict accordance with the system audit standards, successively reviewed the relevant qualification documents, technical data, product application industry, cooperative customers, suppliers' qualifications, etc. of the technology department, business department, quality inspection department, procurement department, logistics department, administration and personnel department of Mingjia Xinyuan, and finally unanimously passed.