By a curvilinear sliding construction example of variable cross-section steel girder in the land area of Zhongxing Bridge in Ningbo, the key technologies of curvilinear sliding of steel girder are specially introduced including the design and type selection of support, track, piston shoe, power and control system. The construction of hoisting, sliding and emplacement of steel girder is successfully completed. The measured linear results of steel girder meet the design and specification requirements, and have the higher economic efficiency and perfectibility, which can provide the valuable reference for the similar constructions.