Redmi in Yuanyang Terrace is the earliest domesticated ancient rice. Its yield per mu is less than 300 kg, with little change in yield and good disease resistance. It can't stand chemical fertilizer and can't apply too much farm manure. Too much fertilizer will lead to rice blast and no pests and diseases, so it is naturally only suitable for organic cultivation. The local Hani people still retain the most traditional way of seed-keeping: when harvesting every year, they go to the fields to find the longest and best ear to keep as seeds, and then sow in the next year and cultivate for generations, which has continued to this day. After years and changes in mountains and rivers, Hani Terraced Redmi has never degenerated and remains the original terraced Redmi.

Zhu Youyong, an academician of China Academy of Engineering and a famous agricultural scientist in Yunnan Province, and his research team found the earliest existing ear of Redmi in an old house built in 1889. Compared with the appearance, microstructure and stem DNA of modern Redmi varieties, it was found that there was no difference in morphological data, microstructure and base between this string of rice seeds and modern Redmi. This proves that they are the same species. Hani Redmi is not like modern rice. After three to eight years of planting, it will gradually degenerate and be eliminated. At the same time, after DNA sequencing of the Redmi varieties planted at present, it is found that the genetic diversity of Hani Terrace Redmi is very rich, and its allele is 3.8 times higher than that of modern varieties on average. Its genetic diversity has eliminated many adverse effects on it, which has kept the quality and yield of Redmi in Hani terraced fields stable for thousands of years.