Since the discovery of fossils of Dingcun Culture in 1954, many scholars have been studying the age of Dingcun Formation in different ways. But there is still no certain answer to it by now. Some researchers think it was formed in the late of middle-Pleistocene, and the others think it was in the early of late-Pleistocene. Their researches normally focused on the changes of the fossils of Mammal in Dingcun Formation and determined its age according to these changes. Because some animals had lived for a long time during middle-late Pleistocene, this made it difficult to do so. As a terrace of Fenhe River, the deposition of Dingcun Formation was strongly controlled by the development of Linfen Basin during middle-late Pleistocene. By studying the landforms in Linfen Basin, we find: 1) there occurred an extensive withdrawal of lake resulting from a regionally structural uplift; while S₁ began to develop; 2) when L 1SS began to develop, the strong down dissection of Fenhe River led to the formation of the terrace(T3). The existence of an erosion surface in Dingcun section and the characteristics of Dingcun Formation indicated that there was a remarkable increase in hydrodynamics when Dingcun Formation began to accumulate. Taking all the above-discussed into account, we draw the following conclusions: 1)Dingcun Formation began to accumulate about 0.13MaBP when S₁ began to form, while a structural uplift took place there. 2)The deposition of Dingcun Formation ended about 52kaBP. The wet and warm climate then caused a strong down dissection and the end of the deposition of Dingcun Formation when L₁SS began to develop. 3)The accumulation of Dingcun Formation was in correspondence with the formation of S₁ and the lower part of L₁ in time.