"The German Ideology" systematically expounded the basic principles of historical materialism for the first time, such as social existence determines social consciousness, the mode of production plays a decisive role in social life, and production relations must be suitable for the development of productive forces, etc., Marking the maturity of Marxist philosophy. This book interprets "The German Ideology" from the aspects of its writing background, writing process, book structure, main content and viewpoints, as well as influence and significance. This book is one of the "Introduction to Marxist Classics Series". The series is led by chief editor Ai Silin, chief expert of MA Engineering and Professor of the School of Marxism at Tsinghua University. It is the first set of large-print single classics and small volumes in China to interpret Marxist classics.