This book firstly systematically summarizes the principle, research methods and technical features of near-infrared spectroscopy analysis technology. It then comprehensively reviews the innovative achievements made in the research, development and application of this technology in oil refining and chemical industries, highlighting the research and practical achievements of the author's team for more than 20 years. These new methods and technology developed by the author's team include more than 80 Chinese invention patents, among them more than 60 authorized patents and more than 40 patents applied industrially. By reading this book, audiences can understand the applications of near infrared spectroscopy analysis technology, implementation steps and results in the petroleum refining and chemical industry.