According to the basic teaching requirements for the course Mechanisms and Machine Theory,and the requirement of bilingual teaching,this textbook is written<br />for students and teachers of mechanical engineering major in universities and colleges in China.<br />There are 12 chapters in this textbook:Introduction,Structure Analysis of Me chanisms,Kinematic Analysis of Mechanisms,Friction and Efficiency of Machineries,Planar Linkage Mechanisms,Cams and Their Design,Gears and Their Design,Gear Trains,The Design of Combined Mechanism and Other Common Mechanisms,Machinery Operation and Adjustment of Velocity Fluctuation in Machineries and Balancing. There are some problems and notes at the end of each chapter for students to grasp and practice.<br />This book can be used as textbook for course Mechanisms and Machine Theory,taught as bilingual teaching material,or be used as textbook for course English in Mechanical Engineering,for students of mechanical engineering major in universitles and colleges. It can also be used as reference book for teachers,students and engineers of mechanical engineering major and other relevant majors.