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应用1992－1996年4－9只黄河上游河曲段部分气象站逐日02、08、14、20点云量和云状，20－08点、08－20点降水资料，计算分析了4－9月黄河上游河曲地区主要降水云层、对流云和层状云的云层特征，出现频率、地理分布及其与降水的关系。结果表明，黄河上游河曲地区4－9月层状云出现频率约15％，其≥0.1mm降水率约50％，地理分布以久治为高值中心，由南向北呈递减趋势。对流云出现频率约60％，其≥0.1mm降水率约80％。并指出黄河上游地区以对流性降水为主，但降水强度小，持续时间短，夜间降水多于白天。
From 1992 to 1996, some meteorological stations in the upper reaches of the Yellow River from April to September, 2009, were subjected to day 02, 08, 14, 20 cloudiness and cloudiness, 20-08 points and 08-20 point precipitation data. Cloud characteristics, frequency of occurrence, geographical distribution of convective and stratiform clouds and their relationship with precipitation in the main precipitation, convective and stratiform clouds in Hequ, Upper Yellow River. The results show that the occurrence frequency of stratiform clouds from April to September in Hequ of the upper reaches of the Yellow River is about 15%, and the precipitation rate of ≥0.1mm is about 50%. The geographical distribution of the stratified cloud shows a decreasing trend from south to north in the long period. Convective clouds appear about 60% of the frequency, its ≥ 0.1mm precipitation rate of about 80%. He pointed out that the upper reaches of the Yellow River mainly convective precipitation, but the precipitation intensity is small, the duration is short, the night rainfall is more than the daytime.