It was analyzed the characteristic of water and sediment volume variation of big branches and main rivers of Jin River.The result showed that there was little or no change in average precipitation,the attenuation trend of runoff and sediment discharge is obvious.%分析了泾河较大支流、干流水量沙量变化特性,结果表明：泾河流域平均降水量变化较小,径流量、输沙量衰减趋势明显。
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