Abstract: On the basis of reviewing the last decades'literatures on ecological effects of pesticides on soil microorganisms,following conclusions can be derived:(1) although some pesticidesmight cause temperate inhibition or stimulation on soil microbe or its activity, the effects would disappear quickly;(2) application of pesticides at their recommended concentrations does not have any adverse impact on soil microbial processes or activities, nor onmaterial cycling in soil or soil fertility; (3) most soil furpigants and fungicides can affectsoil microbial balance, and their effects are usually more intensive than insecticides and herbicides; and (4) long-term investigations indicate that no significant effects on soil microbial communities or activites could be observed in case of consistent use of pesticides,which might be partly due to their transformation and degradation by soil microorganisms.

Key words: Pesticides, Soil microorganisms, Ecological effects, hydrologic properties of source water, shallow soil, rock fracture, prerequisite, epikarst