The book aims to build a political theory of interest politics by adopting an interest-analyzing approach of Marxism to explore the dual characteristics of social interests. Based on the logical start-point, the book unveils the foundations, nature, and characteristics of social-political life such as political power and political right. Then, a systematic research is conducted from perspectives of political behavior, political system, and political culture, following the two logical thread lines as political power and right. Finally, the book sees the analysis of social and political development in accordance with the inter-function of political power and political rights caused by the changes and development of social interests. It is a must-read book for readers interested in the political theory and political development in China.