The main bridge of Shuiluohe Bridge on the Gulin Jinsha Expressway is a deck reinforced concrete arch bridge, and the main arch ring is constructed using cantilever casting method. Due to the influence of terrain and geological conditions, in order to reduce excavation of the mountain, the main arch adopts a “slope arch”, and the elevation of the arch line on Jinsha Bank is 6.7m higher than that on Gulin Bank. The main arch adopts a catenary curve non-hinge arch with a span of 335m, a rise-span ratio of 1/4.2, and an arch axis coefficient of 1.8. The main bridge adopts a left and right split design, and the arch ribs of both bridges adopt two octagonal single box single chamber structures, with transverse diaphragms connecting the arch ribs. The upper structure adopts a span of 11 × A 31.75m prestressed concrete simply supported I-shaped beam and composite bridge deck, supported by columns and cover beams on the arch. The arch base adopts open excavation to expand the foundation.