Three different compositions of NbTi wires have been fabricated by using alternately pure Nb and Ti sheets with Ti contents from 42.5% to 56.6% by adjusting the relative thickness of the Nb and Ti sheets in the monofilaments. Two kinds of heating treatments were discussed and the Nb/Ti interface microstructure and diffusion morphology of cross-section have been investigated by scanning electron microscopy (SEM). The results show that the Jc values are 2 800 A/mm2 at 5 T/4.2K and 4 200 A/mm2 at 3 T/4.2 K. With the increase of Ti content, Jc is higher at low magnetic fields (<5 T), but lower and decreasing rapidly at high magnetic fields. Jc decreases slight slowly for the lower Ti samples. At a given temperature, higher Jc can be gotten by using shorter time of heat treatment for the higher Ti samples, and by using longer time for the lower Ti samples.