本文在考虑地震作用时结构失效相关性情况下，研究了表决工程系统的全局优化问题。根据工 程实践的需要，提出了四类全局优化的数学模型：最优投资、最优投资分配、可靠度约束的最优投资 和可靠度约束的投资决策。在此基础上，给出了表决系统全局优化设计的一般操作过程，并通过数值 算例说明了各类优化模型的使用方法。 In this paper, under the condition of structural failure, the global optimization problem of voting engineering system is studied. According to the needs of engineering practice, four types of global optimization mathematical models are proposed: the optimal investment, the optimal investment allocation, the optimal investment with reliability constraint and the investment decision with reliability constraint. On this basis, the general operation procedure of the global optimization design of the voting system is given. The numerical examples are given to illustrate the use of various optimization models.