详细分析了桁架结构布局优化问题的复杂性 ,指出了其中存在的难以解决或常被忽略的问题。主要包括四个方面 :基结构的建立机制 ;有效的结构布局优化统一模型 ;桁架拓扑优化中的杆件删除和恢复问题及拓扑形式的判别 ;结构重分析困难等。论述了这四个关键问题的重要性、现状和解决时遇到的困难 ,并指出这四个问题的解决是实现“智能自适应求解桁架布局优化”的关键所在 The complexity of the truss structure layout optimization problem is analyzed in detail, and the problems that are difficult to solve or often overlooked are pointed out. Mainly includes four aspects: the establishment of the base structure; effective structural layout optimization unified model; truss topology optimization of the member to delete and restore problems and topological identification; structural re-analysis difficulties. The importance, status quo and difficulties encountered in solving these four key issues are discussed. It is pointed out that the solution to these four problems is to realize the key point of “intelligent and adaptive solution to truss layout optimization”