This study investigated the characteristics of soil infiltration and their influencing factors under different de-farmed plantations of Bambusa rigida and B.pervariabiLisX Dendrocalamopsis daii in Changning County of South Sichuan Province.The results indicated that the characteristics of soil infiltration differed significantly with the depth of soil layer and number of de-farming years.The result of the comprehensive evaluation was obtained by principal component analysis,and seven test stands were classified into three groups based on soil infiltration capability.The first group,which included 5-year defarmed and norrde-farmed plantations of Bambusa rigida exhibited the strongest soil infiltration capability.The second group,which was composed of l-year defarmed Bambusa rigida plantation and farmland,showed a stronger soil infiltration capability.The third group,which comprised the three remaining types of B.pervariabiLisX D.daii plantation,demonstrated a relatively weak soil infiltration capability because of high degree of soil compaction as well as poor soil structure and permeability.The simulation of soil infiltration characteristics indicated that the fitting effect of Kostiakov model was better than that of the Horton model in the study region.