泄水建筑物破坏的主要原因之一是气蚀．　南水库大坝底扎经多年运行后，发现底扎混凝土底板有破坏坑，通过模型试验，确认是气蚀造成的．为此，修改了底孔贴角曲线，采用钢纤维混凝土进行修补．经多年实际运行，底板无新的破坏迹象，处理效果明显． One of the main causes of the damage to the spill is the cavitation. After many years of operation of the southern reservoir dam, it has been found that there is a destructive pit in the bottom concrete floor. Through model tests, it is confirmed that it is caused by cavitation. To this end, modified the bottom hole paste angle curve, the use of steel fiber reinforced concrete repair. After many years of actual operation, no signs of new damage to the floor, the treatment effect is obvious.