This book introduces and integrates material flows with their nexuses in the regional socioeconomic system, to explore the environmental impacts of the system. Currently, many related studies conducted on global and country levels focus on the direct material flows including material inputs and outputs of the socioeconomic system. While they seldom consider the indirect flows derived from the nexus relationships among these materials, especially on the regional levels.   This book concerns the regional differences and highlights the integration of material flows as well as their nexuses in the regional socioeconomic system. It tries to systematically analyze the environmental impacts of the system, clearly explain the relationship between socioeconomic system and natural environment, and provide the reference to achieve the sustainable development for different regions.