Milk is the main source of high-quality nutrition now.Relative to the major dairy products,we don't know much more about deer milk.Deer milk is a kind of milk with rich nutrients.This paper reviews the research progress of deer milk,including the nutritional value of deer milk,the factors affecting the composition of deer milk and the direction of future research.The composition and physiological functions of protein,fat,lactose and other nutrients in deer milk were introduced.The factors affecting the composition of deer milk were analyzed,and the future research direction of deer milk was prospected in order to provide scientific basis for the development of deer milk industry.The purpose of this paper is to provide reference and guidance for further exploring the nutrition and function of deer milk,improving the quality of deer milk and promoting the development of deer milk industry.