牙塘水库主体工程完工后，大坝下游坡脚出现了较大渗水，针对这一现象，利用坝后安全监测设备，进行了2次试蓄水渗流监测，根据监测实测数据，系统分析了大坝渗漏部位危害程度，并作了初步预测及安全评价。

After the main project of Yatang reservoir was finished, much water seepage had appeared on the foot of the dam downstream slope. As for the phenomena, the seepage monitoring was conducted after the first two-tim es of water impoundment. Based on the monitoring data, the seepage position and harm degree have been thoroughly analyzed, and a preliminary forecast and safety assessment made in the paper.