Optics correction in bepcii using response matrix

The second phase commissioning of the BEPCII (Beijing Electron Positron Collider II) had been made a great progress. The optics correction using LOCO based on orbit response matrix contributed a lot to the successful commissioning. This paper discusses mainly on the procedure and results of optics correction at BEPCII. Using LOCO, we have determined the errors of quadrupole strengths, BPM gains and corrector kicks, and found the quadrupole strengths that restore the design optics well. Optics measurement after correction also shows the real optics agrees well with the design one.