Collection of selected, peer reviewed papers from the International Conference on Electrical Information and Mechatronics (ICEIM 2012), December 23-25, 2012, Jiaozuo, China. The papers are grouped as follows: Chapter 1: Mechanical Engineering; Chapter 2: Mechanical Transmission, Vibration and Friction; Chapter 3: Materials Engineering; Chapter 4: Manufacturing Technologies; Chapter 5: Devices and Instruments for Detection and Diagnosis; Chapter 6: Mechatronics, Control and Information Technologies; Chapter 7: Environment Engineering; Chapter 8: Engineering Management and Product Design.