The way of adding packing to the aeration tank in the running wastewater treatment plant can reduce sludge yield and decrease the sludge treatment cost without cutting off the water supply and increasing the volume of aeration tank. The results showed that the production rate of sludge reached 0.2328 which was only 60% of the average activated sludge. In addition, the longer food chain is formed in the aeration tank added with packing;it is helpful for sludge reduction.%利用正在运行的城市污水处理厂好氧池投加填料的方法，可降低污泥产量，减少污水处理厂的污泥处理费用，并且投加填料时不需要停水停产，不需要增加好氧池的容积．试验结果表明：投加填料后污泥产率为0．2328，仅为普通活性污泥法的60％左右．此外，投加填料的好氧池中形成了较长的食物链，有利于污泥减量．
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