Abstract:Based on assembly principle of mega-sub controlled structure system(MSCSS),"the distinguishing equal-reliability optimization criterion"was put forward from the point of view of seismic fortification.Used the Hilbert - Huang transform (HHT)method to synthesis non-stationary artificial seismic wave,the dynamic reliability analysis method based on the probability density evolution theory was used to MSCSS,established the interface program of MATLAB and SAP2000,the size optimization with the proposed optimization criterion was executed to MSCSS under non-stationary seismic action,and compared the results before and after optimization.The research shows that the MSCSS optimization is necessary, the reliability distribution of MSCSS after optimization is more reasonable than before, and response control ability is also improved.