This book is compiled according to the Basic Teaching Requirements of Engineering Drawing Course in Colleges and Universities formulated by the Steering Committee of Engineering Drawing Teaching in Colleges and Universities of the Ministry of Education in 2005 and the national standards published in recent years, such as Mechanical Drawing and Technical Drawing, and is a supporting textbook for the national excellent course Engineering Drawing of Nanjing University of Science and Technology. Chapter * * * 1 1 of this book mainly includes: basic knowledge of drawing, projection basis, projection of basic body and assembly, axonometric drawing, common expression methods of mechanical parts, standard parts and common parts, part drawings, assembly drawings and computer drawing basis. Appendices include: thread and thread connection, key connection and pin connection, rolling bearing, limit and fit, technological structure elements of parts, etc. This book can be used as a teaching material of engineering graphics for engineering majors in colleges and universities, and also as a reference for engineers and technicians.