The spatial distribution and network characteristics of airports in mainland China were analyzed, then improved average travel time was used to analyze airport accessibility and correlation analysis method is adopted to study transport, service, operations and environment. The results showed that airports density in the east is larger than that in the west region. There are 27 airports with more than 1 000 flights in a week, among them 22 airports are located in provincial capital cities, and only 5 airports are in non-provincial capital cities, i.e. Shenzhen, Xiamen, Dalian, Qingdao and Sanya, respectively. The top three of the busiest routes are those between Shenzhen-Beijing, Shenzhen-Shanghai and ShanghaiBeijing, and main departure & destination cities for the top 20 of the busiest routes are Shanghai, Beijing, Shenzhen, Chengdu, Chongqing, Guangzhou and Xiamen. From the perspective of accessibility, eastern regions show higher accessibility than western regions in China. High accessibility areas include Beijing-Tianjin-Hebei, the Yangtze River Delta and the Pearl River Delta. Furthermore, the airport accessibility is often affected by transport, service, operations and environment, among which the most important factors are related to number of connected airports, outbound flights in peak hours, outbound domestic direct-flights and actual outbound flights. The correlation values are 0.706, 0.822, 0.777 and 0.808, respectively. The accessibility also has a strong correlation with number of parking, number of runways, GDP and population, with correlation values of 0.776,0.701,0.679 and 0.695, respectively.