| Transportation network in the process of urban and regional development plays a vital role Town as an open system,between urban and urban and regional interaction is through the connection to the network and the transportation network is the material premise of the development of the towns,for the urban space structure and the system has played a very important role Accessibility is an important index to measure the development level of transportation network.By comparing the changes of accessibility,the status and role of each town in the transportation network can be clearly defined,and the evolution characteristics of regional spatio-temporal pattern can be reflected.In this paper,Inner Mongolia Autonomous Region as the research area,villages and towns as the basic research unit,combined with the road development situation of Inner Mongolia villages and towns traffic accessibility research using network analysis method,grid analysis and Kriging interpolation methods,respectively,2001、2006、2011、2016 The accessibility of road and railway networks in Inner Mongolia autonomous Region was analyzed at five time points in 2019.The average accessibility time and coefficient were calculated to evaluate the spatial and temporal pattern and evolution characteristics of the accessibility of the comprehensive transport network in Inner Mongolia Autonomous Region,and the influencing factors of the spatial and temporal pattern of the accessibility of the comprehensive transport network in Inner Mongolia Autonomous Region were discussed.The conclusions of this paper are as follows :（1）From 2001 to 2019,road network construction in Inner Mongolia has achieved rapid development,with road mileage increasing,network optimization and grade improvement.Expressways,primary roads and secondary roads account for a relatively small proportion of the total,but the annual average growth is fast;The proportion of external roads decreased year by year,The accessibility of towns along the traffic axis has been improved significantly.（2）From 2001 to 2019,the average accessibility of villages and towns decreased by 7.32 h,and the accessibility of villages and towns increased significantly.The range of accessibility was 28.13h、19.03h、15.81h、16.15h、16.11 h,respectively,and the difference of accessibility between towns gradually decreased.The number of villages and towns with accessibility within 10 h increased from 19.28% to 68.67%,and the number of villages and towns with accessibility over 20 h only accounted for 0.13% in 2019,indicating that the travel time of most villages and towns in Inner Mongolia has been significantly improved.（3）The spatial pattern of township accessibility in Inner Mongolia extends and spreads from the north of Chifeng,the north of Zhenglan Banner of Xilin Gol League,Zhengxiangbai Banner,the middle of Wulanchabu and the middle of Hohhot to the surrounding areas in an irregular ring,and the accessibility level gradually decreases.The north of Chifeng,the south of Xilin Gol League and the middle of Wulanchabu are always in the high level of accessibility in the five time sections.The villages and towns with low level of accessibility are concentrated in the west and north of Hulun Buir and the west of Alxa League.（4）The development of transportation network is affected by many factors.Considering the actual situation of Inner Mongolia,the spatio-temporal evolution pattern of Inner Mongolia township accessibility is summarized as policy factors,location conditions,natural conditions,resources conditions,economic conditions. |
