It is said that Niu Erzai first appeared in the Warring States Period of 475-22 BC1. At that time, there were constant wars in various places, so some small governors formed alliances with each other to jointly resist foreign enemies. When a vassal joins the League, the leader will cut off the cow's ear and put it in a cup. The leader will give it to the vassal and make a drink as an oath to show his loyalty. This way is called holding. After the alliance, the cut ox ears will be cut into pieces, then made into cakes, distributed to governors and brought back to their own territory. This kind of cake is called cow ear cake. Later, people thought the cow ear cake was not pleasant to hear, so they changed it to cow ear. This formed the ancestor of Niuer and the earliest Niuer in the world. 12 and 13 centuries, cowear was first introduced to Arab countries, and then spread to Greece, Europe and even all over the world.

After countless years, until the beginning of the last century, Niuerzi was in a single variety and single production method, and it was not until the establishment of the Book of Rites Bakery that Niuerzi was further expanded and developed. After nearly a century's baptism, the Book of Rites Bakery has changed from a small shop to a century-old brand renowned at home and abroad today, and Niuerzi has also changed from a single product to more than ten varieties, dozens of production methods and hundreds of different flavors of Niuerzi. Among them, low-sugar coix seed is the most representative one, which relieves the worry that women who like to eat coix seed will get fat because of eating polysaccharide, and relieves the worry that diabetic patients will aggravate their condition because of eating polysaccharide. Chinese mainland, Hong Kong, Macao, Europe and the United States have made the "Macao special ox ears" produced by the Book of Rites bakery with traditional handicrafts, ancient secret system and advanced production technology.