Li Peiwen's main achievements in teaching and scientific research are as follows: the establishment of a citrus breeding laboratory, the establishment of a Chaoshan citrus experimental field, and the research and selection of excellent disease-free mother trees for controlling citrus Huanglongbing; Establish a mechanized farm in Dongguan as a demonstration farm of agricultural mechanization in Guangdong Province; In this paper, the storage of citrus fruits was studied, and the topic of "fruit storage and preservation" was presided over. The measures to solve the water swelling disease and inhibit the brown spot disease of sweet oranges were put forward by refrigeration at suitable temperature. He presided over the national key research project "Study on Storage and Transportation of Litchi" (1983) "Changes of Endogenous Hormones during Flower Bud Differentiation of Litchi". Participate in the proposal to establish an agricultural research institute (now the Academy of Agricultural Sciences).
Li Peiwen advocates letting a hundred schools of thought contend and pays attention to establishing extensive contacts and exchanges with all parties. Try your best to run a school; Teaching and scientific research is rigorous, profound and knowledgeable. The educational papers include: talking about some obstacles to letting go of "a hundred schools of thought contend", modern agriculture and several problems of agricultural science and technology in Guangdong; The representative works of scientific research include: citrus storage experiment (up and down) and some laws of "swelling disease" of citrus fruits in cold storage. He is a famous educator and agricultural scientist in China, and one of the founders of fruit preservation in China.