The book focuses on the application methods of negative Poisson's ratio materials. This book classifies existing negative Poisson's ratio materials and demonstrates its innovation in the research of negative Poisson's ratio materials by providing methods for the production of negative Poisson's ratio polymers and composites, as well as optimisation methods. The book also systematically introduces the manufacturing methods and various application scenarios of negative Poisson's ratio materials, making it particularly suitable for readers interested in learning about new negative Poisson's ratio materials. This book will benefit researchers, engineers and graduate students in materials engineering, mechanical engineering, manufacturing and related fields.