Starting from the domestic condition in Japan, this book analyzes the causes of the Nanjing massacre and the relations between Japan's thought and society.The book is divided into two parts,I. It describes the miserable situation of the Nanjing massacre and reveals the root of the Nanjing massacre is the spiritual structure of the Japanese, that is, Mikado imperialism and national nihilism, which lead to the moral decay of Japanese people.II. It reveals that for more than 50 years, Japanese militaristic politicians spread lies, try to hide the truth about the Nanjing massacre and continue to preach the national nihilism and the resulting evil consequences - The spiritual structure of the Japanese is the same as that before the war. Without transformation, the morality of the Japanese nation will continue to fall.