The changes of planting modes will affect the diversity and function of soil mesomicro fauna which is sensitive to environmental changes.In this paper,in maize growing seasons soil mesomicro faunas individual number,group richness,diversity and different functional groups were investigated under maize single cropping and maize intercropping at different months.The results showed that a total of 1 473 individuals,which belong to 40 groups,were captured.The individual number of soil mesomicro fauna reduced significantly(P<0.05）in maize intercropping treatment,and the group richness of soil mesomicro fauna reduced insignificantly.This decreasing trends were both observed in different months and soil layers.The trend of individual number of soil mesomicro fauna was:saprophagy>omnivorous>predatory+phytophagous(P<0.05）under maize single cropping and maize intercropping.Under the treatment of maize intercropping the dominance index was increased,however the diversity,evenness and richness index were decreased insignificantly(P>0.05),the individual number of saprophagous,omnivorous,predatory+phytophagous fauna decreased,meanwhile group richness of omnivorous,predatory+phytophagous fauna increased,and group richness of saprophagous fauna decreased and all these changes didnt reach significant level(P>0.05).