[Objective] Using the micro ecological technology of combining the optimal microbial flora and plant( corn),to carry out the pollutants' degradation and repair work. [Method] The corn was selected as the site repair experiment plant,and the research site was divided into four zones: adding immobilized particles,adding free state of bacteria liquid,pure corn,blank control area,collecting samples for nine times,total number of degrading bacteria,petroleum hydrocarbon content and change of oil degradation rate...