This paper focuses on introducing the manufacture technique of the 1 770 MPa galvanized steel wire for stay cable usde in domestic bridges. During the development practices of high strength galvanized wire for the stay cable of Sutong Bridge, Baosteel Group established three key tecchnologies based on the research of manufacture technique and technological innovation. The three key technologies based on the research are: "Double tension + limiter die" process technology, "primary process + fine tuning" initegrated optimization technology and "three-level control" hot galvanization operation technology. With these key technologies, Baosteel Group produced the 1 770 MPa galvanized wire used for stay cable, which has high strength, low relaxation and good torsion performances.