Abstract: Based on daily average temperature,maximum temperature and mean relative humidity of 74 meteorological stations in Jiangxi province during June to August from 1961 to 2010,the authors investigated the occurrence period,inter annual variation,time-frequency variation characteristics as well as temporal spatial patterns of rice heat injury in Jiangxi province using linear and polynomial regression method,Morlet wavelet analysis and the Digital Elevation Model (DEM).The results showed that (1) the rice heat injury mostly occurred in mid July to early August with the most probability from July 13th to July 24th(2)The annual occurrence times of rice heat injury decreased from 1961 to 1982,while increased significantly from 1983 to 2010（P<0.01）,their temporal tendencies for different grades were consistent with in the total times(3)The annual occurrence times for three grades of rice heat injury fluctuated in a remarkable cyclical manner,ie,slight grade fluctuated in the time scale of quasi 2 years,4 years,about 8,15and 25 years,moderate grade fluctuated significantly in quasi 2 years,4 years,about 10 and 23 years periods and severe grade fluctuated in quasi 2 years,6 years,quasi 13 years and 25 years periods(4)The high value of annual occurrence times of rice heat injury on the spatial distribution pattern was located in the northeast of Jiangxi,northern of Ganzhou,Jitai basin and Ganfu plain,and decreased to the surrounding mountains.

Key words: Rice, Heat injury, Temporal and spatial pattern, Morlet wavelet analysis, Digital Elevation Model