The first phase of Nanjing subway proiect is from Xiaohang to Maigaoqiao station

the length of the whole route is 16. 9 km. The main line passes through large area of soil sedimentation layers

which will be easily affected by the stress of earthquake and liquefactcd. Bcacause many factors can cause the soil tobe liquefactcd and the mechanism couldn’t be understood clearly in short period

the geological circumstances should be reestimated in the process of construction. In this paper

an estimation method about spatial analysis of liquefaction of soil is introduced in view of GIS. The analysis process and the establishment of analytical system are detailly introduced. Then it is applied in the project of Nanjing subway

which give the proof for the estimation of the project.