This book is the second volume of the "Introduction to Marxist Classics" series. It first introduces the reason for the writing of "The Holy Family" and its writing process, then analyzes the text structure of the book and its theoretical gist of criticizing the Young Hegelians, and then interprets it section by section according to the structure of the original work. The manuscript mainly elaborates on the ideological changes and theoretical development logic of Marx and Engels, depicts the initial form of historical materialist thought, and then points out the theoretical significance and practical influence of "The Holy Family", advocating a true understanding and reflection of the theoretical quality of Marxism that keeps pace with the times.