Premix feed is made of one or more kinds additive material and diluent mixing uniform mixture together.Trace elements after premixed, beneficial to the uniform distribution in a large amount of feed.Additive premix is compound feed of semi-finished products for small and medium-sized feed mills perfect compound feed or concentrated feed production, can be individually on sale in the market, but can not be directly used for feeding livestock and poultry. additive premix production process in general more careful and strict production than compound feed, ratio of products more accurate, more uniform, produced by the specialized factory.