Since ancient times, the Chinese people usually celebrate harvest in the Mid-Autumn, which is similar to the custom of celebrating Thanksgiving in the North America. The Mid-Autumn has become popular all over China in the Early Tang Dynasty. The Mid-Autumn Festival, celebrated on the 15th day of the 8th month of the lunar calendar, is a day for worshiping the moon. At that day, family members get together and enjoy the bright moon in the sky at night. In 2006, the Mid-Autumn was listed as a China cultural heritage, and in 2008 designated as a public holiday. The moon cake, an indispensable food of the Festival, is often used as a gift for relatives and friends or enjoyed in the family party. Traditional moon cakes are imprinted with Chinese characters with such meanings as “longevity”, “happiness” or “harmony”.