We investigate the new spinor field realizations of the W3 algebra,
making use of the fact that the W3 algebra can be linearized by the
addition of a spin-1 current. We then use these new realizations to build the
nilpotent Becchi-Rouet-Stora--Tyutin (BRST) charges of the spinor non-critical
W3 string.Comment: 8 pages, no figures, revtex4 style, accepted by Chin. Phys. Let