Abstract: Abstract: The number of 3 rhizosphere microorganisms(bacteria, fungi, actinomycete) and 5 enzyme(catalase, proteasee ,urease, phosphatase,invertase) activities were studied during the whole life of corn plant in the sandy loam, loam and clay soil textures in the condition of pond culture.The main results are as follows: before seeding,the number of microorganisms in sandy loam was largest and smallest in clay.Enzyme activities in clay was highest and lowest in sandy loam. The dynamic change of rhizosphere microorganisms and enzyme activities in the 3 soil textures both turned on a parabola,with the peak in the silking stage,and then reducing gradually.In silking stage,the number of the 3 microorganisms was largest in loan and smallest in clay;and the 5 enzyme activites was highest in loam and lowest in sandy loam.At maturity,the number of bacteria and actinomycete was largest in loam and smallest in clay,while the number of fungi was largest in loam and smallest in sandy loam.The catalase activities was highest in clay and lowest in sandy loam,while the rest four were all highest in loam and lowest in sandy loam.In conclusion,the number of rhizosphere microorganisms and enzyme activities were affected by both the development of corn and soil texture.