中文摘要：

通过对山西明代历史文献资料的搜集和统计分析，研究了该地区霜雪低温灾害的等级、阶段、周期与成因。结果表明，明代山西共发生霜雪低温灾害114次，其中轻、中、重度分别为22，66，26次。灾害变化可分为2个阶段，公元1368--1519年为第一阶段，频次较少，强度较弱，以轻、中度灾害为主；1520--1644年为第二阶段，频次较高，强度较大，以中度和重度灾害为主。小波分析显示，灾害存在3个明显的周期，即2～3a，9—14a和45—55a。明代山西在1531—1533年、1578--1588年、1591-1607年和1631--1642年共发生了4次寒冷气候事件。寒冷气候事件都发生在1520年之后，说明明代中晚期的气候比早期寒冷。

英文摘要：

Based on collecting, reorganizing and analyzing the history data about Shanxi in Ming Dynasty, this paper studied the grade series, stage changes, different grades＇ periodicity and reason of the frost-snow and low-tem- perature disasters in Shanxi. The statistical results showed that the disasters had 114 times, the disasters＇ grade may be divided into mild, moderate and severe disaster, and they were respectively 22, 66 and 26 times. The dis- asters can be divided into two stages. The first stage was from 1368 to 1519, the second stage was from 1520 to 1644. The first stage was that the disasters happen occasionally, and most of them were mild and moderate disas- ters. The second stage was that the disasters happen frequently, and most of them were moderate and the most seri- ous. According to wavelets analysis, it was known that there were mainly 2 -3a period, 9 - 14a period and 45 55a period. There were four cold climate events from 1531 to 1533, from 1578 to 1588, from 1591 to 1607 and from 1631 to 1642. The cold weather events had occurred after 1520 and prescribed the climate of the middle and late Ming Dynasty was colder than that of the early Ming Dynasty.