The walkability measurement research of subway station area is carried out with the goal of the construction of rail life circle. The walkability influencing factors of rail station area are sorted out, and the walkability measurement system of subway station area is constructed from three aspects: the walkability of the station itself, the walkability of the service facilities in the station area, and the configuration level of the service facilities. Taking 28 track micro centers in Beijing as research objects, this paper uses ArcGIS Spatial analysis method and pedestrian index method to carry out quantitative and qualitative analysis and measurement of the walkability within 1000m of the station area, comprehensively evaluates the road network accessibility and the facilities configuration balance and accessibility in the subway station area, and verifies the matching degree between the measurement results of pedestrian index and the actual dynamic area by thermal map analysis. The current situation of walkability in Beijing track micro center area is pointed out and corresponding countermeasures and suggestions are proposed.