This book `Design of Concrete Structures' in S.I. Units is based on working stress method as per code IS: 456-2000. All the chapters of the book have been revised and re-arranged in eight parts (32 thirty two chapters) separate aspects of design of one structrual member have been described in different subsequent chapters. In addition to above (i) the service life of concrete structures, (ii) Non-destructive tests/ Evaluation of strength (NDT/NDE) of materials and (iii) futuristic construction materials and Technique (FCMT) likely to be used for the concrete are new topics. Text for these topics (rarely, available in current books by other authros) have been first time given to familiarize the readers.