Pig is prolific livestick.The average litter size of the pluriparous sows is about 10-11.Chinese native sows are extremely prolific.Reproduction technique of sow is an important problem in modern pig enterprises.The technique of reproduction consists of mating, pregnancy, parturition, nursing and so on.The prolificacy of sow is an important target.How to improve prolificacy and a litter meat yield of sow is an important way of developing commercial pig production. The main content of this study is to introduce haw to improve prolificacy and a litter meat yield of sow.