In order to explore the technology of raising killing snail to prevent japanese snail fever,some experimental fish pools,creeks and paddy fields were picked out for raising fish and ducks feeding on killing snails to prevent japanese snail fever. After five years' demonstrative research and poputarization,the epidemic is drastically under control,and snail infection rate and density havedrpped by 71.84% and 80.00% respectively. Infection rates of ploughing oxen and human beings have dropped by 73.36%and 48.05% respectively,with apparent social economic and ecological benefits.