Li is a model worker.

Open up Nanniwan and set an example for yourself. 194 1 War of Resistance against Japanese Aggression entered a stalemate. As an agricultural expert with military reclamation experience in Yan 'an at that time, Li provoked the burden of developing Nanniwan and was transferred to the director of Nanniwan Reclamation Area Management Committee and the head of the Central Military Commission General Farm. During this period, he exerted his expertise and made specific arrangements in land distribution, river dredging, paddy field development, afforestation and forest protection, soil and water conservation, resettlement, fertilizer accumulation, purchasing cattle, farm tools and seeds, opening roads and establishing markets. Commander-in-Chief Zhu De personally presided over the formulation of the famous Nanniwan policy according to the relationship between various aspects involved in the development. Fu's overall planning method

The party, government, army and people who participated in the development of Nanniwan fought bloody battles. Within two years, 359 Brigade and various production units have reclaimed 1.5 million mu of paddy fields and sloping fields in Sichuan. Not only did it achieve self-sufficiency in production, but it also handed over tasks and public grain to superiors and the government. The lonely muddy depression has turned into a grain pile in Man Cang, and cattle and sheep are scattered all over the mountains in northern Shaanxi and southern Jiangnan, which greatly inspired the confidence of the soldiers and civilians in the border area to win the Anti-Japanese War.

Commander-in-Chief Zhu De wrote a letter to Li, praising his achievements and hoping that he would redouble his efforts and continue to guide the 359th Brigade, production teams of various organs and farmers to complete new tasks. Yan 'an Liberation Daily 1943 reported the land adjustment, farm expansion and production technology improvement in Nanniwan Reclamation Area in the second edition on February 2. Li Yisheng pays attention to practical work and rarely publishes articles. But Nanniwan reclamation is an exception.

On April 24th, he published an 8000-word article entitled "How to Lead and Implement Nanniwan Policy" in Yan 'an Liberation Daily 1943, which systematically summarized the land distribution, river dredging, water control and water saving, forest development and protection, and social development prospects of Nanniwan. Xu, a famous patriotic general and Democrat, said in the poem "A trip to Nanniwan": "The cave is full of mountains and the army is strong, and the soldiers grow their own grain." Also in Miscellaneous Songs, there is "the people love Director Li, who is well-planned and well-intentioned." General Wang Zhen praised him as an experienced agricultural expert who can devote himself to the production and construction of Nanwan with the spirit of commander-in-chief. The cadres of the 359th Brigade have great respect for his diligence and practical working attitude.