With extremely high critical current density (Jc) and excellent strain tolerance, Nb3Al superconductor is considered as an alternative to Nb3Sn for application of high-filed magnets. However, complexity in the phase formation of Nb3Al hinders the Nb3Al superconducting wires to satisfy the requirement of engineering applications at present. Here, we have reported the improved performance of simple-structured 18-filamnet jelly-roll Nb3Al precursor long wires fabricated with rapid heating and quenching (RHQ) process. The effects of processing conditions such as tensile stress, heating current, and post-heat treatment on the performance of simple-structured 18-filamnet jelly-roll Nb-Al precursor long wires are studied in this work. It is observed that the optimized conditions have significantly improved the performance of the Nb3Al wires. Especially, a balance between the tensile stress and strand structure is important to maintain a continuous processing and a high quality of the wires. Flux pinning mechanism related with the phase formation of Nb3Al is discussed.