Abstract: Superconducting cosθ dipole magnet is widely used for construction of highenergy superconducting accelerator as basic element. Success of acceleratordepends on the property of the magnets. The results of the investigation andanalysis of the magnet are presented. A method to determine conductor positionquantitatively in the magnet is given. Thus the multipoles inside the dipole magnetcould be efficiently controlled and an ideal design of the magnet is expected.