For breeding of leech, make its escape processing, can guarantee the leech farming production, because the flexibility of leech activities is higher, if do not take active measures, it is easy to cause in the process of breeding a large number of leech escape, is not conducive to leech farming, caused economic losses, at the same time pay attention to the water quality in the process of leech farming, feed, providing food, it can bring certain influence to leech growth.