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利用河南１９５１～１９９８年的干旱灾害实况资料，统计分析了干旱灾害过程频率的季节、地理及年际变化特征。结果表明：河南干旱灾害过程的季节性特点明显，豫北地区以春旱为主，豫中、豫南地区以伏旱为主，豫东地区以秋旱为主，豫西地区以春、秋旱为主；二季连旱的频率豫北达５０％～６０％，豫东豫西地区为４２％，豫南地区不足３０％；干旱成灾面积大于６７万公顷的年份具有连续性，平均持续长度４年，最长的达７年。８０年代以来，河南干旱灾害影响呈严重发展趋势。
Based on the factual data of drought disasters in Henan from 1951 to 1998, the seasonal, geographical and interannual variability of the frequency of drought disasters were statistically analyzed. The results show that the seasonal characteristics of the drought disaster in Henan Province are obvious. The spring droughts are the main part in the northern part of Henan Province. The main part is the autumn drought in the east part of Henan and the southern part of Henan in the autumn. ; The frequency of continuous drought in the second season reached 50% -60% in the north of Henan, 42% in the west of Henan and Henan, and less than 30% in the south of Henan; and the continuous drought-affected areas of more than 670,000 hectares were continuous with an average duration 4 years, the longest up to 7 years. Since the 1980s, the impact of drought disaster in Henan Province has been a serious development trend.