This book provides a systematic and comprehensive introduction to the technical principles, materials, processes, and equipment of the electron beam wire deposition technology (EBWD), while focusing on the research results of the author scientific research team engaged in this technology in China. It mainly introduces the conceptual connotation, principle, and characteristics of the EBWD technology, its position and function in the additive manufacturing technology system, the direction and trend of technological development at home and abroad, the fundamentals and application results of the EBWD technology, including technical principles, equipment technology, special materials, manufacturing technology, quality testing, and application practices. So this book can serve as a reference book for teachers, students, and scientific researchers in scientific research institutions who are engaged in relevant studies.