In the light of the Teaching Guideline for Computer Application in Middle Vocational School issued in 2009 by the Education Ministry of China, this book is compiled with 7 chapters, including Basics about Computer, Usage of Windows XP, Internet Application, Application of Word 2007, Application of Excel 2007, Application of Multimedia Software, Application of Powerpoint 2007,etc..For the sake of the middle vocational education, each chapter is attached with application examples like words input drill, personal computer assembly, office/home network construction, personal cyberspace construction, making propaganda manual, making statistical form, making digital photo album, making DV, making products introduction PPT. Integral training could be conducted when combined with what the students have learnt to improve their overall skills in using computer. In order to be easy for teaching purpose, each chapter is followed by drills and exercises.