The construction technology of cable-stayed bridge developed rapidly because its beautiful appearance, economical cost and long span. Load of cable-stayed bridge is undertaken by tower, cable and girder jointly. Cable-stayed cable must undertake all deck load, its stress amplitude is big, and it is exposed, so it is a important part of general concern.

　　PWS(Parallel Wires Stay cable) is used widely at present, but it has some disadvantages:
1. complex production process, high technical difficulty etc.

2.Difficult transportation. Diameter, length and self-weight of PWS is more and more big with the cable-stayed bridge span increasing. It is difficult to transport these big cable by road.

3. it is necessary to use large-scale special equipments for lifting, installation, dragging, and stressing.

4.Difficult to replace. It is need to replace stay-cable in the case of traffic interruption.

5.Out hot-extruded HDPE sheath is easy to damage and is difficult to repair to achieve the original quality.

　Based on the above consideration, FASTEN multi-strands stay cable system is developed. It is a kind of stay cable consisted of filled epoxy-coated strands. The strands could be transported to construction site in rolls, installed and anchored one by one. The outside of cable is a HDPE pipe. The anchorage of this cable system is filled with grout or not according to requirements.
FASTEN multi-strands stay cable system is of excellent performance in fatigue resistance and anti-corrosion and is easier to transport, install and construction, which make the construction of cable-stayed bridge more reliable and economical.