Relay structures are common in active normal fault zones, and play an important role in fault interaction and linkage. In addition, relay structures also affects the evolution of drainage system and the transportation of sediments into basin, the process of fluids migration and trapping. The Langshan piedmont fault, which is located in the western margin of the Hetao Depression in Inner Mongolia, is a largescale normal fault system that has been continuously active since the late Cenozoic. There are different types of relay structures in the fault zone. Two types of relay zone have been identified: one is formed by two paralleled fault between which the rely ramp evolved from “soft link” to “hard link”; the other kind is wedgeshaped relay formed by a fault extending to another one. The preexisting structures in basement control and affect the distribution of the normal faults as well as the morphology of the relay zone. The NNE trending mylonitic foliation within the basement controls the strike of the linked normal faults zone, with the preexisting thrust fault plane partially utilized by normal faults. Newly formed faults migrate gradually to the basinward direction. The latest active faults are located at the margin of the basin and even within the basin. The Langshan piedmont normal fault extends southwestward gradually along the strike direction.