This book on “Computer Digital Technique System “is very useful for those who learning about beginners of digital computer world. This book is an overview of Number Systems, Flip-Flops, Combinational and Sequential circuits and also computer Architecture Model system. This book tells a wide range of existing and meaningful operations of data processor. The main aim in writing this book is to present very clear, systematic, and simple problems of computer Digital Technique system. so that the student may study recent trends and innovations in their mathematical and some practical perspective.