The effect of different enzyme treatments which dealt with α-amylase combined with composite cellulase on the final yield of dietary fiber and removal function of starch, protein, phytic acid in wheat bran dietary fiber was studied. The results indicated that the effect of treatment with α-amylase combined with composite cellulase was significantly better than that with one enzyme alone, and it significantly reduced the content of starch, protein, and phytic acid in dietary fiber. And the yield of wheat bran soluble dietary fiber (SDF) was raised to 25.3%.