Abstract: Background, aim and scope: Hexi Corridor, at prehistoric and historic era, is an important channel for the cultural exchanges between the East and the West in Eurasia. Progress on archaeological investigations and environmental changes studies of it in recent years has made it possible to study on its spatio-temporal evolution and environmental changes of local sites.Based on the archaeological survey data of Hexi Corridor, with the methods of cultural distribution boundaries、cultural center etc, a comprehensive analysis has been made on its spatio-temporal evolution process. Materials and methods: Site data using Gansu Institute of Cultural Relics and Archeology, Archaeological, Cultural Institute in Beijing University edition of the Report on prehistoric archaeological survey in Hexi corridor; The map data are based on China DEM with 90m resolution; China 1: 250,000 Grade 1, Grade 3, Grade 4 and Grade 5 river grading datasets; China 1: 4000000 vegetation datasets; China 1: 100,000 state desert datasets. With the aid of GIS extracting the environmental information (elevation, river, vegetation and sandy land) of corresponding sites in present time and taking the production and living style of ancient human into consideration, a prediction on the envitonmental change and its causes of ancient and present time has been concluded. Results: the Bronze culture after 3.5ka BP mainly spreads from west to east spread; during 3-2.4ka BP Shanma culture and Shajing culture are redistributed in most parts of the Hexi corridor The extreme climates of about 4ka BP, 3.6ka BP and 3.0ka BP have dramatically changed the ancients' elevation distribution. The river at the site of the site , Vegetation and sandy land all undergo different degrees of change. Discussion: By analyzing the relationship between the cultural evolution of ancient sites with environmental factors and considering the climate in the study area and its adjacent areas, This article discuss the dynamic mechanism of the evolution of the ancient culture in the Hexi Corridor. The Extreme Climate Events led to the evolution of ancient culture from a single Machang culture to Qijia culture and Siba culture in 4ka BP, from Qijia-Siba culture to Dongjiatai-Xindian culture in 3.6ka BP. and from Dongjiatai - Xindian Culture to Shanma-Shajing culture in 3ka BP. Conclusions: Climate change is the main driving force for the evolution of the ancient culture in Hexi Corridor. The replacement of ancient culture corresponds to a significant environmental changes. For example, significant short-term climate deterioration led to the collapse or transformation of ancient culture. While Factors such as the cultural exchanges, political groups and the immigration of overseas cultures have a major impact on the cultural distribution. Recommendations and perspectives: When discussing the motivation mechanism of cultural evolution, the impact of cultural evolution from Cultural exchange, political factors and the introduction of overseas culture should be considered.
Keywords: Hexi Corridor; ancient sites; environmental transition