以国内外混凝土坝加高工程施工实践为基础，系统总结混凝土重力坝后帮整体式加高施工中的4项关键技术，即混凝土原材料及配合比、新老混凝土结合、原有结构体的控制拆除与转移、施工期资源的时间与空间调配。针对其中的每一项关键技术，分析了施工技术难点与特点、施工技术要求，并总结了技术措施和解决策略，以期为同类型工程建设提供参考与借鉴。

Based on construction practice of worldwide concrete dam heightening project, 4 key construction technologies of concrete gravity dam heightening project by the integral heightening mode on the existing dam by the down stream side and on the dam crest were systematically summarized. The 4 key technologies are concrete raw materials and mix proportion, jionting between new concrete and existing concrete, controlled demolition and transference of old structures, and resources temporal and spatrial allocation curing construction period, For each key construction technology, the construction technical difficulties, features and requirements were analyzed, and the technical measures and solving strategies were summarized to provide construction reference for the same type project in the future.