The light-duty steel structure residential demonstration project is analyzed by mode-superposition response spectrum method, the elastic and elastic-plastic time-history analysis, push-over analysis, which used the finite element software ETABS and PKPM. The safety is assessed. The seismic behavior of this structural system is analyzed under different site classification, design characteristic and seismic intensity, and is compared with the ordinary steel structure, concrete structure, masonry structure. The results show that, this structural system can meet the current codes under frequent and rare earthquake action. But the column has a surplus stable stress values. And it is suitable for application in large areas in China. In high intensity areas and compared with the different structure system, it shows that the lateral has the main effect on this structure.