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Although the rapid heating quenching and transformation method has been used as a general way to fabricate high-performance \Nb3\Al superconducting wires, the complicated heat treatment apparatus and techniques obstruct its practical application. In this paper, Nb–Al saturated solid solution (\Nb(\Al)ss) was fabricated by the mechanical alloying method at room temperature, and the superconducting onset transition temperature (Tc\-onset) of the \Nb3\Al bulk transforming from the \Nb(\Al)ss reached 15.3 K. Based on these results, two groups of \Nb3\Al superconducting wires were fabricated in combination with the in situ powder-in-tube method to investigate the effects of ball milling time, wire diameter and the cross-sectional shape on the superconducting properties, and the factors that affected the critical current density (Jc) were also discussed. The best value of Jc in magnetic induction at 6 T was obtained in the round wire with a diameter of $\Phi$1.0 mm fabricated with the powder ball milled for 5 h. [ABSTRACT FROM PUBLISHER]