Abstract: The waste produced from soy extraction was used to feed and fatten pigs in the experiment performed by the author. The three-way cross pigs Duchangda and Dudachang weighted at 3 stages of 15-30, 30-60 and 60-90 kg were selected and the different formulas were adopted in different stages in the feeding expeiment. Finally, the optimum formula was ascertained. The conclusion was that the dried soy waste not only could enhance the growth performance of pigs, but also could reduce the cost in the fattening process of pigs. So the higher economic benefit was got.