Li Jitong was familiar with astronomy and geography, carefully observed the changes of astrology and collected many things. Every time he saw something, he recorded it, leaving a lot of valuable information for future generations to study the natural phenomena at that time.
During this period, Li Ji had the most frequent contacts with Jiangyin Wenyou and his students. His apartment is full, singing, giving poems as a preface, and being affectionate. Li Ji's criteria for making friends do not include local officials and rich gentry. Even Changzhou Sima and Jiangyin county magistrate. I have visited, and I have avoided it.
During the period of 10, Li Ji spent a lot of energy to find, collect and sort out poems, books and paintings lost by his predecessors and contemporaries, and finally compiled ***8 volumes of Notes on Tianxiangge in 1675. Tianxiang Pavilion was originally in Lishan Jiulian Temple, and Ji Zhichang's poem "Nine-Day Trip to Lishan Jiulian Temple" said: "Tianxiang Pavilion is empty and nostalgic, and the clouds and shadows return to the mountains. "Miscellaneous notes about anecdotes in Tianxiangge's essays in the late Ming and early Qing Dynasties are mostly in Nanming. When Yiyou (1645) was guarding the city against the Qing Dynasty in Jiangyin, Li Ji was still a young man and lived outside the city. The words about guarding city recorded in the book are all what Li Ji saw and heard at that time. In the second year of Xianfeng (1852), Nanhai Wu obtained the manuscript of Tianxiangge Essays through others in Yangcheng Bookstore. After reading it, he thought that the essay was "Ding Ge Miscellanies and Stories", which was cut into two volumes and attached to Tianxiang Pavilion 1. Wu believes that "the full text of Wan Yuanji's preface to preparing for the army is cherished by going to Chuyang, and the things in Xinjiang are unbearable." , is enough to make up for the lack of history. Other unofficial history, also not so detailed. Another example is Wu Sangui's Ci "Chen Yuanshi" and Niu Yuqiao's "Song", and the differences among different departments are also enough for reference. "
Li Ji borrowed a lot of books by relying on his own library. After years of unremitting collection, textual research and screening, he compiled a vast collection of books such as Geographic Atlas 120, 16 and 40. Unfortunately, these works have been lost, and only his Introduction to Military Guides has been handed down from generation to generation.