Abstract: In order to fully utilize regional climate resources, promote the promotion of high yield and quality of Dong Tibetan red rice, and assist in the development of rural revitalization industries, the Dong Tibetan red rice in Hunan province was taken as the research object. The potential growth period of Dong Tibetan red rice in the research area was estimated using the average temperature for 20 consecutive days after the end of full heading, the daily temperature range of 10 days before the universal heading period to 10 days after the universal heading period, and the average minimum temperature for 30 consecutive days after the initial heading period from 1981 to 2010, to construct climate quality evaluation indicators for the head rice percentage, chalkiness degree, and alkali spreading value of Dong Tibetan red rice in the research region. Using the Libich minimum factor law for multi factor evaluation, based on the comprehensive evaluation results, analyze climatic quality grades for Dong Tibetan red rice in Hunan. The results showed that: (1) the entire growth period of the Dong Tibetan red rice planting research area lasted for 140 to 152 days. The main distribution time for the beginning of heading was in early to mid.The main distribution time for the common heading period and the end of safe heading were in mid to late August. (2) The appearance quality (chalkiness) was the main factor affecting the climate quality grades zoning of Dong Tibetan red rice in the evaluation indicators of head rice percentage, chalkiness degree, and alkali spreading value climate quality. (3) Based on a comprehensive evaluation of the climate quality grades of Dong Tibetan red rice in Hunan, the very excellent and excellent grades were mainly distributed in the central and western parts of Zhangjiajie city, the northern and western parts of Xiangxi prefecture, the central and southern parts of Huaihua city (excluding the channel), and the western part of Shaoyang city (Suining).

Key words: Dong Tibetan red rice, Climatic quality grades, Zoning