Abstract: Effect of methyl bromide)68.1g/m²) and methane sodium (7.5mL/m²)on soil microbe population and soil nitrification capacity was investigated in field.Results show no fumigant inhibition on actinomycete population,but some degree of fumigant inhibition on total bacteria population is noted.However,nitrite bacteria population and soil nitrification capacity are strongly inhibited.The number and kinds of soil fungi change significantly after fumigation.Soil microbes recover to normal levels 9 weeks after fumigation.