Abstract: The characteristic of hot damage,including the occurrence frequency of hot damage in every 10 days of July and August,hot damage density,and characteristic of concomitance of hot and waterlogging,was analyzed by using normal statistical methods and Mann-Kendal mutation detection methods,based on daily meteorological data from 1960 to 2010 at Jingzhou,Qianjiang,Jianli,Shishou and Honghu in Four Lake Basin of Jianghan plain.The results showed that annual hot damage days was mainly about 3 to 19 days in the Four Lake Basin from 1960 to 2010,but it declined slightly during early 1960s and middle 1980s,then increased again.A mutation point was found in different time at each station.The slight hot damage was the main type,which mainly focused on the three stages (the middle 10 days of July,the last 10 days of July and the first 10 days of August).Even two hot damages occurred continuously,during which the interval was 1 to 3 days.Meanwhile,other damage usually followed the slight hot damage,which had the highest probability that occurred 39 times in last 51 years.The concomitance of slight hot damage and slight waterlogging was the main type of concomitance of hot and waterlogging in the Four Lake Basin,average occurrence was 15 times in last 51 years,during which the interval of two damage was 1 to 5 days.

Key words: Hot damage, Concomitance of hot and waterlogging, Four Lake Basin, Hot days