Compiled by the teaching team of Nanning University, this textbook provides a systematic overview of the National Quality Infrastructure (NQI) framework proposed by international organizations such as UNCTAD, UNIDO, WTO, and ISO. The book explains the key components of NQI, including metrology, standardization, inspection and testing, certification and accreditation, and market supervision. It also presents representative development cases from Germany, the United States, Japan, and China. This textbook serves as both a training and reference resource for enterprises, institutions, and government departments engaged in quality management and infrastructure development, and as a teaching reference for students majoring in quality management, industrial engineering, and related disciplines.