Degradation dynamics of carbendazim in soil and its effects on community diversity of soil m icroorganism s were investigated in a m icrocosm m im icking soil ecosystem.Half 2 life of carbendazim in soil was measured to be 8.6 and 6.8 datlevels of 2.0 mg kg^-1 and 4.0 mg kg^-1,respectively.Values of average well color development (AWCD) of soil microorganisms were significantly inhibited within the initial periods after treatments of carbendazim at levels of 2.0 mg kg^-1 and 4.0 mg kg^-1 soil.Meanwhile,significant reduction in the richness,evenness and superiority of soil microorganisms was also observed,which indicated that the inhibitory effect of carbendazim on soil microorganisms was increased with its concentration in soil.After the initial variation,soil microorganisms adapted gradually to carbendazim and recovered to levels similar to that in the control without carbendazim.