The Book on Centre-state Relations under the Indian constitution is an attempt to analyze the relations between both Units of Federation during the last about Seventy years of its working. The Articles incorporated in this Book have been divided into three categories viz; History and Development of Federalism, Cooperative Federalism and Harmonious relations between Centre and States in India. Papers include discussion on Citizen Amendment Act, Conversion of J&K State into Two Union Territories, Functioning during present Crisis of COVID-19 etc. The papers have been written by renowned academicians, judges, sociologists, Financial experts etc. An attempt has been to discuss the relations in present scenario based upon the experience faced during the last seven decades.