Located between Jiulongpo District and Banan District in Chongqing, the south bank of the bridge is Lijiatuo Industrial Zone (Banan District) and the north bank is Jiulongpo District. The total length of the main tunnel is1288m, the span combination is: transition tunnel (53m)+main tunnel (169m+444m+169m)+transition tunnel (53m)+south approach bridge (8x50m), and the bridge deck width is 4 lanes (in the middle) At present, it is the largest cable-stayed bridge in China. The cables are arranged on both sides of the superstructure, forming two symmetrical cable planes (also called double cable planes). The structural system of the bridge is a prestressed concrete cable-stayed bridge with twin towers and double cable planes, and the towers and piers are consolidated. The main girder is a longitudinal suspension system, the intersection of tower and girder is provided with a transverse limit device, and the joint between the transition hole of the north station platform and the south approach bridge is provided with a large displacement expansion joint. The main girder adopts plain double-beam section, and the main girder rib is 2.5m high and 1.7m wide. The beam spacing is 4.5m, and transverse prestressed steel beams are set. Longitudinal prestressed steel tendons are set in the cross sections of the middle and side spans of the main girder, and OVM anchorage and high-strength and low-relaxation steel strands are used. The main tower is vase-shaped, with a total height of 14 1.5m and a rectangular hollow section. The stay cables are arranged with fan-shaped double cable planes, with the cable spacing of 9m on the beam and uneven arrangement on the tower, with the cable spacing of1.5 ~1.6m. There are 24 pairs of cables in each cable plane. Anchorage adopts LM7 cold cast anchor anchorage. The two main pier foundations of the main bridge are treated differently according to the topographic and geological conditions and the difficulty of construction. 2 # pier adopts 2.6 ~ 3.2m variable cross-section excavated pile foundation, and 3 # pier adopts open caisson foundation. The foundation construction of this bridge started at 199 1 year 1 1 month. It is expected to be completed by the end of 1995. Completed on 1997. Designed by Shanghai Municipal Engineering Design Institute and constructed by Chongqing Bridge Engineering Company.