Abstract: Alfalfa is a ideal forage fodder for sow, as it contained high content of crude protein, balanced amino acid, rich in vitamins and minerals, easy can be utilized crude fiber, especially, carotene, vitamin E, vitamin B2, folic acid and selenium can reduce the embryo mortality, increase offspring number, and increase effective reproduction age. The advantage of adding the appropriate amount of alfalfa into sow feed in fresh or dry powder can reduces product cost. This article mainly summarized the effect of alfalfa crude fiber and several important vitamins on the sow production.