五强溪坝区地质复杂，大坝外部监测系统规模较大，从整体上把握系统结构有助于进一步优化设计和观测方案的具体实施，文中对系统中几个原则性问题作了概括性阐述。 The geological conditions of Wuqiangxi dam area are complex and the external monitoring system of the dam is large in scale. Grasping the system structure as a whole helps to further optimize the implementation of the design and observation plan. Several principle problems in the system are generally described .