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Patent Pending PROBLEM TO BE SOLVED: To provide an improving method of the n-value of a Bi based superconductive material. ; SOLUTION: This improving method of the n-value of the Bi based superconducting wire in which partial melting treatment is applied to the Bi based superconducting wire in a magnetic field can be used as the improving method of the n-value of the Bi based superconducting wire in which the partial melting treatment is applied to a silver sheath Bi2212 superconducting wire in the magnetic field.