利用1952年以来的降水资料，针对近10a渭河径流量锐减的异常情况，着重就近10a降水变化特点及其对径流的影响进行了分析。分析结果表明，近10a流域降水量是有记载以来最少的10a，其中渭河下游、赤沙镇以上及泾河上游地区减少最甚，并且还表现出汛期开始早、结束提前，伏旱不严重、秋雨不出现等特点；由降水变化所引起年径流的减少量达20．8亿m3，约占实际变化总量的58％。 Based on the precipitation data from 1952, aiming at the anomalous drop of runoff in the nearly 10-year Weihe River, the characteristics of the precipitation change and its effect on runoff are analyzed. The analysis results show that the precipitation in the past 10 years is the least since the record was recorded, of which 10a is the lowest since records were recorded. Among them, the lower reaches of the Weihe River and above the lower reaches of Chisha and the upper reaches of Jinghe are the worst, and also show that the flood season begins early, ends ahead of schedule, Not occur; the annual runoff reduction caused by precipitation changes reached 2.08 billion m3, accounting for about 58% of the total actual changes.