This book has studied the principle, essence and development law of sharing economics. First of all, it analyzes the inevitability of sharing economics as the mainstream and determines that its research object is the social resources of the production, gathering, exchange, use, distribution and value creation disciplines. Secondly, it defines and analyzes the connotation, scope, concept, characteristics, research hypothesis, property right attribute, constituent elements and income distribution of the sharing economics which aims to improve the efficiency of resource allocation and reduce the market transaction cost. This book is characterized by the construction of a theoretical system composed of contingency, cooperative consumption, cognitive surplus and impersonal transaction. This book provides readers with a theoretical theory of sharing economics and an important theoretical reference for innovative entrepreneurship.