Abstract: High temperature is one of the extreme weathers that have attracted attention now. Characteristic analysis of the impact of high temperature during the growth of early rice in Guigang city, Guangxi was carried out. Finding out the basic law of its weather process is of great significance for the reasonable arrangement of early rice production and protection against high temperature heat damage. The meteorological observation data from 1960 to 2019 and relevant statistical data of the agricultural department at three national ground-level meteorological stations （Guigang, Guiping, Pingnan） in Guigang city was analyzed. To find out interannual law of the occurrence of high temperature heat damage during the early rice planting period in Guigang. The results showed that the general trend of the degree of heat damage caused by high temperature in early rice in Guigang city was a spatial difference that gradually strengthens from west to east. The interannual change of high temperature heat damage presents a “V” shape trend, and the high point of the “V” trend was gradually rising to a serious situation. The interannual occurrence rate was 66.7%, with an average occurrence of 1.1 times/a and a total number of days of 5 days/a. The extreme high-temperature weather in the study area experienced periodic oscillations was 21 d and 42 d, which experienced two obvious phase changes. Among them, the high temperature process in 2018 occurred frequently and throughout the entire early rice planting period.

Key words: early rice planting, heat damage of high temperature, trend analysis, Mann-Kendall test, wavelet analysis, Guigang city