Abstract: In order to make a quantitative study about the spatial characteristic of accessibility of civil airports in the Jingjinji region, the paper mainly used spatial analysis module of GIS to generates spatial distribution map of the accessibility in Jingjinji region based on road network data, railway network data and urban metro subway network data after summarizing previous research papers, further, the paper analyzed spatial characteristic of the region accessibility. As the result show, airports accessibility have the characteristic of high in the south, low in the north, middle area better than edge area in the Jingjinji region. Accessibility of eastern airports is the best, the northern is the worst. The accessibility time of 51.1% of Jingjinji area is 1.5-6h, so the level of accessibility is overall lower in the region. According to valid service area that the paper defined, airport valid service area could be divided into three grades: Zhengding international airport, Capital international airport and Binhai international airport belong to first grade, Handan airport, Sannvhe airport belong to second grade, Ningyuan airport and Shanhaiguan airport belong to third grade. By analyzing the accessibility time, we can know that Capital international airport have the largest valid service area in 0-1.5h area about 25.23%, Zhengding international have the largest valid service area in 1.5-3h and 3-4.5h areas about 23.5 and 21.9%. Form the research results, the general development of the airports is imbalance, it is necessary to plan and adjust the layout of airports. We should build the new airports in the northern and western region to increase the valid service area. The traffic network should be improved to expand the valid service area of existing airports, the function of existing and new airports should be clear and definite to develop the regional hub airports and improve the civil service efficiency.