The Donggutuo site is one of the key Paleolithic sites located on the eastern edge of the Nihewan Basin, which provides vital information about the technological behaviors of the Early Pleistocene hominins. The sediments of the site are mainly silt, clayey silt, sandy and clay, which are typical fluvio-lacustrine deposits. Some horizontal beddings can be seen clearly. As the lithics were buried in the fluvio-lacustrine deposit, it is indispensable to explore the site formation before interpret archaeological remains, for that the hydrologic forces potentially took part in the accumulation of the archaeological materials. From 2016 to 2020, a new excavation was undertaken by the Institute of Vertebrate Paleontology and Paleoanthropology and Hebei Provincial Institute of Cultural Relics and Archeology at Trench 1 area. Through this new excavation, tens of thousands of stone artifacts and a large number of fossils have been unearthed and we have a new understanding of the cultural layer. We identified a new cultural layer based on the former 6A cultural layer, which was defined as 6A2 now. The sediments of layer 6A2 is dominated by sandy gravel and the distribution of the lithics are not uniform. It indicates a high-energy depositional environment. However, the majority unearthed lithics of layer 6A2 do not show the characteristics of being modified by high energy flow or transported over long distances. The evidence between sediments and lithics is conflicting in this layer. This study can help us reveal the formation processes of the Donggutuo site in more detail. The methods of the research can be divided into two categories, the analysis of the lithic and the study of sediments. On the basis of observation of artifacts, we identified some equivocal stone remains (geofacts). In view of this, we designed and implemented a transportation-simulate experiment, it establishes a reference of the morphological modification in a certain context through time. The comparison study between experimental specimens and artifacts from the Donggutuo site will help us to distinguish artifacts from geofacts. In addition, through the study of sedimentary contexts, spatial distributions, debitage size distribution, lithic abrasion and artifacts orientation shows that most of the lithics in layer 6A2 were not transported by high energy water flow, but buried in situ. So we can infer that lithics and the sandy gravel layer may not be formed simultaneous which implies early human occupied the site after the main sedimentation matrix had formed.