中文摘要：

清代江南地区至少有145年发生过疫灾,疫灾频度约54.10%;康熙、乾隆、光绪三朝为疫灾群发期,集中了整个清朝57.20%的疫灾年份;夏秋季节是疫灾的多发季节,约74.60%的疫灾发生在夏秋两季;疫灾频度的长期上升趋势明显,整个明代经历了7个波长为20-60年的完整的波动周期。水灾、战争、霍乱大流行是诱发疫灾的重要因子。清代江南地区疫灾地理分布的总体特征是：府级城市的疫灾多于县级城市;沿海城市的疫灾多于内陆的城市;疫源地区城市的疫灾多于非疫源地区的城市;人口稠密区城市的疫灾多于人口稀疏区的城市。

英文摘要：

Jiangnan Area in the Qing Dynasty had experienced at least 145 Years of Epidemic Dis- aster, with an average epidemic frequency of 54.10%. In all Years of Epidemic Disaster, 57.20% oc- curred in the Kingdoms of Kangxi （1662--1722）, Qianlong （1736--1795） and Guangxu （1875-- 1908）. In seasonal level, the prevalence of epidemic disasters seemed more preferable in summer and autumn, in which occurred about 74.60% epidemic accidents and spread most extensive epidemic are- as. By the statistic analysis on Epidemic Index of Decade and Epidemic Counties of Decade in the Qing Dynasty, we found the fact that the prevalence of epidemic disasters of Jiangnan Area in 1644--1911 showed a long--term increasing tendency in frequency, and the whole process could be divided into 7 waved cycles with 20--60 year wave--length and 1--10 year wave--height. The epidemic disasters of Jiangnan Area usually were caused by flood, war and cholera. The general distributional characteris- tics of epidemic disasters in the Qing Dynastical Jiangnan Area showed below, epidemic prevalence in prefecture cities was more severe than in county cities, in convenient cities than in remote cities, in natural epidemic foci than in unnatural epidemic foei and in densely populated areas than in sparsely populated areas.