In order to study the non-destructive,on-line and quantitative detection method of rubber sealing structure aging state,the finite element model of rubber O-ring seal structure was established based on finite element method.Different aging states of equivalent models were achieved by inputting material parameters.The change rule between natural frequency and aging state was summarized by modal analysis.The correctness of finite element model was proved by pulse excitation test.Then,the random vibration analysis with a compression ratio of 14.3% was completed based on modal analysis,and the variation rule between the response power spectrum and the aging state was summarized.The results show that the established finite element model can reveal the changes of the response characteristics of the structural aging state,and provides priori knowledge for non-destructive,on-line and quantitative detection methods of the aging state.