Abstract: The solid ditillers' grains is the by product of whrite spirit produced by using the method of solid ferment. In this paper, the solid distillers' grains is seperated into rice huck and residue dy using the liquid separate technology. The rice huck is reused in the ferment. The residue is used as the livestock feed. The facts, effact on the seperate properties of the solid distillers' grains, is theoretically analysed and experirnentially investigated. A liquid seperate equipment is optimum designed.