In aerospace, mechanical environment was abominable，according to that, shock response of double-deck isolation system was studied, and the shock response spectrum under 8000g acceleration shock had been analyzed. Using a rubber damper to improve the shock resistance of system, and analyzing several factors for affecting shock resistance of rubber damper.The experiment show that, under 8000g acceleration shock, the shock resistance of double-deck isolation system is better than single-deck isolation system. Meanwhile, the span of rubber damper could affect the shock resistance of system. It is very important to the analysis of shock resistance and the structure design for aerospace products.