Compared with the UHV demonstration project, the installation span, the traction tension and the height difference between suspension points are more larger in the extension project of the UHV Nanyang substation. Especially the large-crossing line of 92 m span above the HV reactor in Southeastern Shanxi puts forward higher requirements for the installation reliability and operation facility. In the large-crossing line installation of UHV Nanyang substation, the designed and optimized lift fitting and connecting fitting are introduced and analyzed, providing references for similar project in the future.