针对上游法筑坝坝体浸润线高、危害大、降深难的问题，采用水平孔—竖直袋状砂井联合自流排渗新技术进行排渗。该方法不仅排渗水量大，浸润线降低幅度大，不需动力和维护，而且施工简单快捷，投资费用低，适用于各类尾矿坝浸润线的降深。 In view of the problem of upper saturation line, big damage and difficult to decrease of the dam body of upstream dam, the horizontal hole-vertical bag-shaped sand well combined with gravity drainage technology was used to discharge. The method not only has the advantages of large water leakage rate, large reduction of wetting line, no power and maintenance, simple and quick construction, low investment cost, and is suitable for reducing the saturation line of various tailings dam.