Abstract: In view of different geological features of buried-hill weathering crust areas in the north and buried karst area in the south of Halahatang area in the northern Tarim basin, the Ordovician paleolandform and ancient drainage systems are restored using impression method and a combination method of paleostructure and residual impression. The karst fracture-cave body development characteristics and its formation mechanism are studied under 4 different paleo-landform environments, and 4 karst fracture-cave body development patterns are established such as buried-hill weathering crust zone, upper karst slope, lower karst slope and karst basin. The buried-hill weathering crust zone is dominated by surface-karst fracture-cave system; large fracture-cave bodies of Yijianfang formation-Yingshan formation and underground river channel systems mainly occur in the upper-karst slope; 2 sets of large fracture-cave bodies namely Liang-1-Liang-2 member and Yijianfang formation-Yingshan formation are developed on the lower karst slope; and karst fracture-cave bodies are distributed along faults in the karst basin