This is an introductory book to lead beginners to grasp AutoCAD 2012, in which the author introduces in detail the basic knowledge and operation methods of AutoCAD 2012 that beginners shall master, and gives expert guide against problems beginners may encounter in using AutoCAD 2012 so as to help beginner s to avoid twists and turns at starting point. The book mainly covers AtuoCAD 2012 installation and startup, basic AutoCAD knowledge, auxiliary drawing tools, layer and design center, drawing and editing of two dimensional graph, word note and tables, size note, block and outer reference, drawing and editing of three dimensional graph, comprehensive application of mechanical and architecture design as well as hands-on experiment.