This study focused on the parameters of root architecture among four dominant species at three different stages of vegetation succession in a Karst peakcluster depression by the method of whole digging sampling. (1) Root forms forked branches and the topological index (TI) tends to close to 0.5 with the secondary forest 0.57, the primary forest 0.49 and the shrub 0.46. It is indicated that forked branches are beneficial for root to expand living space in poor and shallow soil. (2) The average root length of the dominant species in three various vegetation restoration was 37.01 cm, all above 34.29 cm. The increasing of connection length is beneficial for plants to survive better in nutrientpoor Karst soil. (3) Due to different adaptative strategies of plants under different succession stages, the root branching rate in secondary forest is lower than that in shrub and primary forest. (4) The area of the cross sections under the dominant species in three succession stages conform with the Leonardo da Vinci theory and do not change with diameter of branches. (5) There was no significant difference in soil nutrient, moisture acquisition, and soil space expansion among three vegetation restoration processes. It suggested that the same ecological adaptation strategies that root forms forked and longer root link length, lower branching rate were adopted under the dominant species in three succession stages despite the high variability in Karst peakcluster depression.