1, Lecture 15 on Chinese Historical Geography: The earth is the foundation of human existence and the stage for human activities. Human's dependence, utilization and transformation of the earth have become various fields of geographical research. Historical geography is the study of past geography. The main areas involved in the study of historical geography in the book are territory, environment, administrative regions, cities and so on. The basic problems and historical development of these fields are sorted out and introduced.

2. Layout the world: the rise and fall of politics is often related to the success or failure of the military, and geography is closely related to the military. Therefore, an in-depth understanding of the rise and fall of ancient military geography in China is an important key. A remarkable feature of this book is that it vividly summarizes the general trend of ancient military geography in China as a "chessboard pattern". In a word, this book is military in geography and political in military geography.

3. Long Water Nazi Compilation: The main papers before Tan Qixiang 1982 have been compiled into Long Water Collection, and the first and second volumes were written before and after liberation respectively. After his death, the editor compiled his main paper published after 1982 as "Continuation of Long Water Collection". This book is a representative historical geography paper in various aspects and periods selected from these two papers.