For the successful launching of spacecraft,whole-spacecraft vibration isolation is applied to the improvement of severe dynamic environment during launch,and the decrease of amplitude of vibration input from the launch vehicle.Experimental results of the transmissibility of vibration isolators show that the response amplitude of spacecraft with vibration isolators is much lower than that without vibration isolators.The result of random experiment shows that the requirement of launch can be satisfied.Besides,the discussion of damping reliability indicates that the performance of isolators is little changed with the failure of some dampers.The redundant property can satisfy the launch requirement.