Gasification is not new in India and China. Gasifiers in different forms were used for cooking foods. During the Arab Oil Embargo of 1973 the U.S. Government provided financial support for several proof-of-concept gasification projects, including the world’s first Integrated Gasification Combined Cycle (IGCC) electric power plant. Presently, several IGCC power plants are operating throughout the world. The book, Gasification System is a compilation of research based literatures useful to students, scholars, scientists and engineers and help in integrating the advance technology that will contribute in production of energy for filling the gap between available and needed energy. The book covers most recent technologies on gasifiers and biogas in 9 chapters; Introduction, Gasification System, History of Gasification, Biogas Technology, Development of Biogas Plant, Mathematical Modeling of Gasification System, Design of Gasification System, Commercialization of Gasification System and Testing and Evaluation of Gasification System. It may be a useful book having up-to-date information on the subject.