Based on the classic adverse selection model, this book sets up the cyber "lemons" market model and analyzes the basic rule of asymmetric information. This book focuses on the topics as following: Is there "lemons" in e-commerce market? What rule do the cyber "lemons" characterize? How to build the cyber "lemon" market model? What is the particularity of adverse selection in cyber markets? What is more, how to eliminate or avoid the cyber "lemons" in Chinse e-commerce market?This book aims to provide the accumulation for e-commerce research and support decision-making for management in Chinese e-commerce markets, and suggests trust management solutions to eliminate or decrease the cyber 'lemons'. Through this book, it helps readers understand the ideas and effective methods of trust management in the Chinse e-commerce market, while deepening the reverse selection model and theory.