The paleo-geomorphy before the sedimentary of the Permian formation is recovered with the Moulage method, then the karst geomorphy unit is partitioned.

• 采用印模法恢复出本区二叠系沉积前的古地貌，划分出岩溶地貌单元，古地貌恢复表明，研究区古地貌总体表现为起伏不大，西高东低，相对高差最大约130米。