This book presents the concepts: the welfare system of universal integration and the welfare mode of universal integration. In this book, the author explores the foundation of fair baseline about the universal integration on the basis of critically inheriting the domestic and international social welfare theories, comprehensively explains the connotation, subject and application of fair baseline theory. It systematically discusses the theoretical basis, basic features, scientific evidence, system composition and operating mechanism, introduces the experience in the west and Asia about the construction of social welfare system, further investigates and understands the public needs about the social welfare, talks about the system design of the welfare system of universal integration and provides some realistic, individualized and operative suggestions for promoting the welfare system of universal integration.