The custom of ancestors eating pasta began in the Warring States Period. But in the Warring States period, there were no grinding tools for grinding flour. At that time, flour was mashed with tools such as Chu Jiu, and the output could not be too large, so there were certainly not many people who could eat it at that time. A ceramic mill was unearthed from an ancient tomb in Yinque Mountain, Linyi, Shandong Province, which is the earliest real abrasive tool found in China so far. With abrasive tools, the habit of eating pasta gradually became popular in northern China.