Among the long-span spatial structures, the grid shell has many advantages compared to the other spatial structures.Because of the combination of the reasonableness of mechanics and the economy production,and characteristics of the light-duty and the mature design methods,this structure has more wider application than the others.At present,the static stability problem of spatial grid shell structure has been well solved,but the research about dynamic properties and seismic performance is imperfect,especially about single-layered cylindrical grid shell.So this paper does some research about the seismic performance on the base of numerical analysis.