The milk skin is also called dry cheese. It is similar to the western food called "Ji Ji". It is one of the famous special products made by farmers in the interlaced area of ​​Qinghai farming and animal husbandry. It is the most delicious nutritious food in milk products. Its production history has been nearly a hundred years. The method of making the milk skin is to cook the fresh milk into the pot, control the firepower, cook it slightly, stir it constantly, let the water evaporate slowly, concentrate the milk juice, and condense it into a round yellow milk cake at the bottom of the pot. The shade is dry and ready.