Abstract: Rubber spring is one of the core parts of the double-mass horizontal vibrating centrifuge with vibration-isolation, noise-reduction and energy-storage functions. The rubber spring tends to lose its elasticity due to presence of boundary cracks under the effect of alternate loading actions and change of external environment. In order to extend the service life of rubber spring, the rubber spring design and its stressed state simulation methods are proposed based on analysis of its stress-induced deformation state and the problems existing in its working process, and simulation and comparison are made of the deformation using finite element analysis method. Result of analysis shows that under the rated loading conditions, the rubber spring with a structural dimensions of 100 mm×100 mm×150 mm can work with a much improved performance and an extended service life.