Abstract: Based on the meteorological data observed by Jingzhou agri-meterological station from 1954 to 2006,the occurrence trend and climate background of chilling injury in midsummer in Jianghan Plain of Hubei Province were analyzed.The Results indicated that the occurrence frequency of the chilling injury in August in Jianghan Plain increased,while the interval of the chilling injury occurrence became longer and the strength of the temperature drop enhanced.The low temperature weather lasted three days or with lower than 23℃ of the daily mean air temperature in August had appeared for four years in succession since the 21st century.The climate backgrounds caused the chilling injury were mainly flooding during the rainy season and dog days,the cold summer and the cold air nitration.These extreme weather events led to a serious damage to the middle season rice production.The monitoring,forecast and precaution of these extreme weather events should be enhanced.

Key words: Jianghan Plain, Jianghan Plain, Midsummer, Chilling injury