南京长江第四大桥主桥为主跨1 418 m的双塔三跨连续式钢箱梁悬索桥，为国内同类型桥梁之最，居世界第三。本文从索鞍吊装、牵引系统与猫道架设、主缆索股架设、主缆紧缆、索夹及吊索安装、钢箱梁架设和主缆缠丝等方面对南京长江第四大桥悬索桥上部结构安装施工关键技术进行了系统介绍，可为类似大跨度悬索桥上部结构施工提供参考。

The Fourth Nanjing Yangtze River Bridge, the longest suspension bridge in China, as well as the third one in the world, is a two-tower three-span suspension bridge with the main span of 1 418 m. The key construction techniques for the superstructure, including lifting and installation of the cable saddles, erection of the traction system, walkways and main cables, rearrangement of the main cables, installation of the suspender cables and the cable clamps, erection of the steel box girders and wrapping of the main cables, are discussed in detail in this paper. It can provide some references for the construction of the superstructures for the similar suspension bridges in the future.