He paid close attention to plants all over the world, accumulated 30 years' work according to what he saw and heard and sorted out relevant records in ancient books, and wrote two books, Textual Research on Plant Names and Textual Research on Plant Names. The former is the pioneer of modern flora in China and occupies an important position in the history of botany in China. He studied plants, emphasized "visual inspection" and opposed "ear eating". For example, when he was working in Shanxi, he noticed that the statement in Shanxi Tongzhi that Shanxi did not produce Codonopsis pilosula was inconsistent with the reality. He found that Codonopsis pilosula is not only wild and rich in Shanxi, but also cultivated artificially. He pointed out that Codonopsis pilosula is "sprawling, with staggered leaves, big nodes like fingers, wild roots with white juice, autumn flowers like Adenophora adenophora, blue and white in color, and the natives planted them for profit". He also sent people to dig out the seedlings of Codonopsis pilosula in the deep mountains for artificial cultivation and observation, and found that "it is also easy to reproduce, and its shape is quite similar to that of new alfalfa, but its smell is close to that of Astragalus membranaceus". He compiled all kinds of records and expositions about plants in ancient books of past dynasties into Textual Research on Plant Names and Facts, which included 838 kinds of plants. This not only prepared necessary historical materials for me to further study various plants and write textual research on plant names, but also provided convenience for future generations to consult the historical materials of China plant literature.
The 38-volume Textual Research on Plant Names and Facts records 17 14 species of plants, more than 500 species than the Compendium of Materia Medica (Li See Shizhen). Its factories are all over China 19 provinces. The geographical range and species of plants recorded in it far exceed those of previous dynasties. Wu Qizhuo referred to the plant classification method in Li Shizhen's Compendium of Materia Medica, but made great improvements. Textual Research on Plant Names and Facts classifies plants into 12 categories: cereals, vegetables, grasses, grasses, weeds, creeping weeds, herbs, poisonous weeds, squares, fruits, wood and so on. , more concise and reasonable than before. Under each category, describe several plants, including their names, shapes, colors, tastes, places of origin and uses, so as to conform to the actual situation. He corrected many wrong records in previous literature by personally investigating and textual research on ancient books. In the textual research of plant names and facts, the description of each plant is accompanied by a plant map drawn according to the real thing. The accuracy of some maps can be used to identify families and uses, and some can even be planted. Different from the cursive scripts of past dynasties, the textual research on plant names and facts began to get rid of simple practicality and turned to botanical works, which was very close to the modern flora, providing valuable information for future generations to further study the plants in China. Many modern botanists often use it to determine the Chinese names of some plants and understand their uses, which is highly praised by scholars at home and abroad and widely quoted.