Abstract：In view of the insufficiency in the definition of seismic performance level and quantification of performance index for underground structures. This paper divides the seismic performance level of underground structures into four levels, referring to the classification method for performance level of ground buildings, and gives a brief description of the structure functions for each level. Based on the classification, 18 shallow-buried subway stations different types of rectangular sections are selected as analysis objects, and a three-dimensional finite element model of soil-structure is established for them. The model is analyzed by the Pushover method analysis of underground structure with inverted triangular load distribution, and the complete capacity curves of key components of each station structure are obtained. By means of geometric mapping and probability statistics, the lateral seismic performance index system, including the limit value of inter-storey drift, is established for the rectangular frame subway station structure. The quantitative standard of performance index can guide the seismic design of underground structures to a certain extent, and provide reference for further development and improvement of the existing seismic performance index system of underground structures.
