Mechanical model for a quasi-zero stiffness vibration isolation system is established. The quasi-zero stiffness condition is obtained and the stiffness characteristic of the system in the equilibrium position is analyzed. According to the characteristic of the system, it is proposed that the length of the interval corresponding to the dimensionless stiffness is regarded as the objective function for optimization. Then, the optimal mathematical model is established. A method for K̂<1 optimization of the quasi-zero stiffness vibration isolation system is presented. The simulation model is built by means of Adams. The results show that the performance of the optimized system is greatly improved. Finally, the reliability and validity of the optimization method is validated by the Adams simulation. This work can offer an idea and a reference for optimization of vibration isolation systems.%针对一种准零刚度隔振系统，建立其力学模型，求得准零刚度条件，分析系统在平衡位置的刚度特性。根据系统特点，提出将无量纲刚度K̂<1所对应的位移区间长度作为优化的目标函数。建立优化数学模型，结合遗传算法，提出一套准零刚度隔振系统的优化设计方法。建立隔振系统的Adams仿真模型，仿真结果表明优化后系统的隔振性能有很大的提升，验证优化方法的有效性和可靠性。为此类隔振系统的优化设计提供思路和参考。
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