This article discusses the advantage and shortcoming in characteristic and economics aspects of the parallel strand stayed cable and the parallel wire stayed cable when they are made as the main stress elements of the cable stayed bridge.

Introduce to parallal strand stayed cables with four layers protection, which applied in stayed cable bridges at abroad in recent years, and the adopted plan of the major bridge of Queshi Bridge.

According to the research status of viscous shearing damper,the finite element program-ANSYS is adopted to analyze the strand stay cables,and the influence factors of vibration-reduce effect wh.

Based on the engineering characters of Shengmi bridge and characters of parallel wire cable,this paper demonstrates the structural characteristics and key construction technology of special tied for Shengmi Bridge,such as installing,pulling and force adjustment,which may be of certain reference to design and construction of external prestressing project.

In order to provide the theoretical basis for design and safety assessment of parallel wire cable fatigue properties,the fatigue life model of parallel wire cable is established.