Abstract: [Objective] The aim that analysis of dynamic evolution and coupling relationship between the gravity center of ecological services value and socio-economic factors in Beijing-Tianjin-Hebei region, is to explore socio-economic driving factors of the regional ecological service value, so as to provide a certain basis of Beijing-Tianjin-Hebei collaborative development in the key areas of ecological environmental protection.[Method] Using the concept of the gravity center and correlation formula, applying various counties in land use, urban and rural population, the three major industries data of Beijing-Tianjin-Hebei region to calculate the gravity center of ecological services value, urban and rural population, the three major industries added value and their shift direction and offset distance from 1990 to 2010.Constructing the overlap of the gravity center and change consistency formula to study their dynamic evolution and coupling relationship between the gravity center of ecological services value and socio-economic factors in Beijing-Tianjin-Hebei region.[Result] 1) The shift direction of the gravity center of regulating services, supporting services and providing services value was similar from 1990 to 2010, the shift direction of the gravity center of cultural service value was different. The shift direction of the gravity center of rural population and primary industry added value was similar, while the shift direction of the gravity center of urban population, secondary industry added value, and tertiary industry added value had their own characteristics. 2) The offset distance of the gravity center of regulating services, the total value of ecological services and the three industrial added value was far for more than 20 years, while the offset distance of the gravity center of supporting services, providing services and cultural services value was close relatively. 3) The coupling of the gravity center between total ecological services value and urban population,tertiary industry added value, secondary industry was higher than it with the rural population and primary industry added value.4) Change consistency of the gravity center of the total value of ecological services, secondary industry added value, tertiary industry added value and urban population had changed since 2000.[Conclusion] The complexity of the gravity center shift was caused by regional unbalanced development, the asynchronous of the gravity center shift of socio-economic factors resulted from the asynchronous process of industrialization, the dislocation of urbanization and industrialization leaded to the dislocation of ecological services value; affected by the coordinated development of Beijing-Tianjin-Hebei, the gravity center of ecological services value and socio-economic factors will be further offset in the future.

Key words: Beijing-Tianjin-Hebei region, ecological services value, socio economic factors, dynamic evolution of the gravity center, coupling relationship