1, authentic water for cooking soup in Lamian Noodles, Lanzhou should be replenished at one time. If cold water is added halfway, the temperature of soup drops suddenly, which will destroy the balance of raw materials heating and affect the extravasation of soluble substances in raw materials.

2. The raw materials for cooking soup should be boiled in cold water. If they are put into boiling water, the surface of the raw materials will be easily solidified due to sudden high temperature, which will affect the overflow of protein inside the raw materials, and the soup will not reach the purpose of fresh alcohol.

3. If the firepower is too small, it will affect the freshness of the soup.