Wide-angle X-ray diffraction (WAXD) was used to investigate the crystal transition of nylon-12,12 under annealing and drawing. The triclinic alpha-form could be obtained by crystallizing from a melted state or by annealing the gamma-form at high temperature (above 150 degrees C). The crystal structure of the alpha-form annealed at 90 degrees C didn't change with time except for the perfection of crystals and an increase in the degree of crystallinity. The pseudo-hexagonal gamma-form could be produced by crystallizing from the melted state at low temperature (90 degrees C) or by drawing at 90 and 160 degrees C. This is the first time a Brill transition has been observed under drawing conditions, instead of under the traditional conditions of continuous heating and cooling. Experimental results also confirm that drawing inducement is preferable to produce the gamma-form and plays an important role in determining the crystal structure; there is a competition between drawing inducement and thermal inducement.