Potato chip is a common snack in Lanzhou and its flavor is created according to the tastes of customers: hot and spicy, sour, savory and spicy, and super spicy. These tastes are very popular among customers. Natives of Lanzhou call potatoes “Yangyu”, which is a dialect. People of Northwest China have a singular love for potatoes because potatoes planted in Northwest China have richer protein than soybeans and more lysine and tryptophan than any other grain due to the special geographical environment, soil quality and climate of Northwest China.