In order to probe the effect of green manure application ease nematodes harm causing tobacco replant,a field plot experiment,in which two levels of chemical fertilizer rates and five levels of green manure application amounts assembled into ten treatments,was conducted to study the relations of green manure application amounts and nematodes harm to tobacco in red soil in Yunnan. Results showed that the amount of parasitic nematodes and non-parasitic nematodes tended to increase at the end of tobacco harvest...