The effects of a titanium addition to the matrix on the superconducting properties and the metallurgical aspects of the composite-processed Nb3Sn have been studied. The titanium added to the matrix is found to diffuse readily into the Nb3Sn layer. The small amount of the titanium addition to the matrix significantly increases the growth rate and the critical current density Jc in high magnetic fields of the Nb3Sn layer. A Jc(Nb3Sn layer) of over 1×105 A/cm2 has been obtained at 16 T for the Nb/Cu-7 at. % Sn-0.35 at. % Ti composite wire reacted at 750 °C for 100 h. The titanium addition to the matrix may be practically more promising than the titanium addition to the core.