Abstract: Based on the daily temperature data of 70 meteorological observation stations in Fujian province from 1971 to 2020, the duration days of different range of the daily maximum temperature was defined the evaluation criteria for high-temperature heat damage level of tea plants. The temporal and spatial distribution of heat damage times are counted and analyzed. The risk regions of tea plants high-temperature heat damage in Fujian province were divided. The results showed that in recent 50 years, there were more light and moderate heat damage to tea plants in Fujian province, with a large range of interannual changes, and the occurrence times showed an overall upward trend. The occurrence times and frequencies of heat damage since the 21st century were higher than those in the last century. The frequency of heat damage increased gradually from south to north in tea areas. The areas with high heat damage and high risk are mainly distributed in the low-altitude areas of Wuyi mountains, Shanling mountains and Daiyun mountains to the north of Jiufeng mountains. Farmer should combine the specific geographical and climatic conditions and the results of heat risk regionalization to carry out planting management modes such as planting drought resistant varieties or reducing summer and autumn tea picking, so as to improve the microclimate of tea gardens and reduce the loss of tea income caused by high temperature and heat damage in summer.

Key words: Tea plant, High temperature and heat damage, Risk regionalization