How did the ancestors of Li nationality in Hainan Island move from hunting at sea to farming culture?

There are 130 sites of the last primitive stone culture in Hainan Island, which are about 5000 years ago and contain rich primitive relics. The owners of these cultural relics are the ancestors of the Li nationality. The ancestors of the Li nationality lived and developed Hainan Island at the earliest.

During the Qin and Han Dynasties, Hainan Island was closely related to the Han Dynasty. Emperor Wu of the Han Dynasty sent people to open Qiongdao many times and set up two counties, Zhu Ya and Boer. Some mainland Han people moved to Hainan Island to live with Li aborigines.

After that, a large number of Han people immigrated to Hainan Island, and "village people", Miao people and Hui people also immigrated to the island. A large number of immigrants brought advanced iron production tools and farming production technology, which made Hainan ancestors gradually move from hunting at sea to farming culture and further developed social productivity.