It has been reported that higher addition levels and coarse brans have more impact on the gluten network and dough rheological properties coarse bran can retain significantly more water than medium or fine bran, but bran particle size had no significant effect on dough water absorption. Self-absorption of the wheat bran may have an effect on the transportation of available water and on the pasting of starch in the cooking process. Those factors may result in the manifold effects of wheat bran with different addition levels and particle sizes on the firmness values of DWCN.