According to the archives of the Forbidden City, he compiled Records of the Palace in the Late Qing Dynasty and Secret Talks of the Qing Palace, which revealed the secrets hidden in the Forbidden City for hundreds of years and had great historical value.
He cited British and Japanese diplomatic archives as Mr. Sun Yixian's biography, which revealed a large number of historical materials never involved in domestic books and periodicals. He has written biographies of celebrities in the Republic of China, Song: the pioneer of democratic constitutionalism in China, Biography of political figures in the Republic of China, and Biography of Yan: Struggling for global rural reconstruction for 60 years. It is the first study of people in the history of the Republic of China.
He looked through the Japanese military departments and diplomatic archives and mastered a lot of little-known historical materials of the Sino-Japanese War of 1894-1895. In the 1970s, he compiled and published two volumes of magnum opus "History of the Second Sino-Japanese War", which recorded the long-term war of resistance between Japanese soldiers and civilians for the first time, and was also recognized as the most authoritative and excellent work on the history of War of Resistance against Japanese Aggression by academic circles.
He paid attention to the study of history based on historical materials, and edited and published a series of historical materials such as China Modern History Series, China Modern History Series, China Historical Materials Series, Republic of China Historical Materials Series, and Rural Construction Historical Materials Compilation, which provided rich and valuable historical materials for historians. A large number of historical papers published by him have been compiled into Modern History Series, History and People and published. His papers and works were also published in Chinese mainland, becoming reference books for China historians to study the history and figures of the Republic of China.