It is a rail-cum-road cable-stayed bridge with the biggest span in the world. With the total length of 4.01km, it integrates intercity railway, national railway and highway as a whole. The bridge is double-deck structure with the 4-lane highway in the upper-deck and 2-track railway in the lower-deck. The main bridge is a double-pylon cable-stayed bridge with steel truss girders, whose span and main span are 1215m and 567m respectively. The span of the main span, slope of the main truss member, rupture stress of the cable stay, and compression and tension bearing are the best of the world.