Hangzhou Bay Beihang Bridge is a diamond-shaped double-tower double-space cable-plane steel box girder cable-stayed bridge with a main span of 448m, with a navigation clearance of 47m. It is designed according to a two-way six-lane expressway with a design speed of 100km/h. In order to improve driving safety, for the first time in China, a wind barrier is set outside the railing (from 4.27m near the tower to 3.4m far). In order to ensure the meaningful landscape of the whole bridge, a cable shock absorber with steering mechanism is developed. Theoretical analysis of the whole bridge cable is carried out and a real bridge test after installing the shock absorber is carried out.