Yu Wei Zheng Xiaozi refers to a health certificate issued by the Henan Provincial Health and Wellness Committee. Yu refers to Henan Province, Wei refers to the Health Department and Xiao refers to the Center for Disease Control and Prevention. The certificate indicates that the file is a certificate. The term "Yu Wei Zheng Xiao" is mainly used to confirm personal health status, and it is usually necessary to have a physical examination and provide relevant information before handling it.