Based on the experiments，the heat treating technology process for the dual phase roping steel wire is suggested as follows： austenization and water quenching for full martensite structure→critical annealing and quenching for dual phase structure followed by tempering→after acid pickling and phosphorisation，continuous cold drawing multisteps until expected end dimension of the wire→artificial aging for stress relief. According to the production process，the tensile strength of the wire may be achieved over 1800 MPa while the anti-torsion and bending fatique properties can exceed the value stipulated in the National Standard.