Cancel at the end of the trading day. Wheat auction refers to the phenomenon that the transaction price of a certain wheat contract is lower than the cost price or not lower than the cost price, resulting in no subscription or delivery of the contract, which is finally cancelled at the end of the trading day. Wheat is an important food crop and belongs to Gramineae. Wheat originated from the fertile crescent zone in the Middle East and is one of the earliest cultivated crops in the world. Wheat is widely planted all over the world, and it is the second largest food crop in the world, second only to corn. There are many kinds of wheat, which can be divided into winter wheat and spring wheat according to different sowing seasons. Wheat can be divided into hard wheat and soft wheat according to grain quality; Wheat grains can be divided into white wheat, red wheat and flowering wheat according to color. Wheat has high nutritional value and is rich in starch, protein, fat, minerals, calcium, iron, thiamine, riboflavin, nicotinic acid and vitamin A, etc. Among them, carbohydrate accounts for 75%, and protein accounts for 10%, which is one of the main sources of calories needed by human body. In addition, wheat is also rich in dietary fiber, which helps to promote digestion, enhance satiety and control blood sugar.