考虑外界腐蚀性介质影响的化工受腐蚀结构的最优设计及维修策略是一个非常复杂的规划问题。本文研究了化工结构在其服役过程中动态可靠度的变化规律 ,提出了化工结构在其设计基准期内仅考虑一次维修加固处理条件下的最优设计和维修决策的实用方法 ,对化工受腐蚀结构的全局优化设计具有一定的理论参考意义和工程实用价值 The optimal design and maintenance strategy of chemically corroded structures considering the influence of external corrosive media is a very complicated planning problem. This paper studies the variation of the dynamic reliability of chemical structures during their service period, and proposes a practical method for chemical engineering to consider only the optimal design and maintenance decision under the conditions of maintenance and reinforcement during the design reference period. The global optimization design of the structure has certain theoretical reference significance and engineering practical value