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中文摘要：
采用五点滑动平均法、趋势系数法、Mann—Kendall趋势检验法和方差分析法对大伙房水库流域1951-2006年的降水资料进行了分析。结果表明，1980年前年降水序列明显下降，1980年后微弱上升；季降水序列中夏季降水与年降水变化基本一致，秋季降水明显下降，春、冬两季降水变化趋势不明显；年降水和季降水序列均具有明显的周期变化规律。这些规律可为大伙房水库流域降水的中长期变化趋势估报提供参考。
英文摘要：
The precipitation data of Dahuofang reservoir basin in the past 60 years were analyzed by methods of five dots average slippage, trend coefficient, Mann-Kendall test and variance analysis. The results showed that： annual precipitation series decreased obviously before 1980, and increased slowly after 1980; seasonal precipitation series had different variable trend, summer precipitation series were essentially accordant with annual precipitation series, autumn precipitation series decreased markedly, variation of spring and winter precipitation series were not significantly; both annual and seasonal precipitation series had significant periodic variation. The above-mentioned analysis could provide reference for hydrological forecast and water resources utilization.
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