This book aims to clarify the concept of impact investing by combing the international experience and the practices in China, promote the standardization of the measurement and evaluation system of impact investing, contribute to the establishment of an impact investing ecosystem in China, and guide investment to consider both the social and environmental impact and profitability. This book mainly contains four parts: the definition of impact investing and the similarities and differences with other related concepts; the development, characteristics and trends of global impact investing; the development and the current situation of impact investing in China; a case study in China.