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The microstructure effect on the superconducting properties of (Bi,Pb)2Sr2Ca2Cu3O10 + x ceramics containing different additions of nanocrystalline NbC powder was analyzed using information interpretation of multifractal formalism. By introducing NbC additions, the midpoint transition temperature Tc of the ceramics can be raised by more than 10 K. The optimal NbC content evaluated with the use of the multifractal parametrization methodology is 0.35 wt %. The corresponding increase in Tc may attain 12–16 K. The crystallite and pore substructures in the ceramics are found to be closely related. The information approaches are shown to have great potential for structural characterization of superconducting materials and optimization analysis of property–structure–composition relationships.