The superconducting transition temperature( Tc) and upper critical magnetic field( Hc2) of Nb3Al superconductor are similar to Nb3Sn,but it has better strain tolerance and higher critical current( Jc) at high field. Therefore,Nb3Al superconductor is considered as a very appealing material for use in future high field application. At present,the Nb3Al superconducting wire with 2. 6 km long length had been reported,which exhibited a large Jcof 1 000 A / mm2at4. 2 K and 15 T. Due to the complexity of fabricati...