The book is written according to vocational schools characteristics, organically combine the engineering mechanics, mechanical principles and mechanical parts as a whole. The book is divided into 10 chapters, including machinery and basic mechanical design, analysis the stress and balance of a object, the rod deformation and strength calculation, commonly used mechanical transmission (four-bar linkage, cam mechanism, the screw mechanism, intermittent motion structure, gear drive, belt drive, chain drive and gear transmission), the general parts (threaded connection, key connections and pin connection, shaft, bearings, couplings and clutches) and hydraulic drive, pneumatic drive contents. This book can be used as the secondary vocational schools ""Basic Mechanical Course and also available for skilled workers self-leaning materials.