Alkaline is a 1 to 3 ratio of soda ash to water. Alkaline, also known as alkaline water, or edible alkaline water, is a compound food additive, is the material in the food process, the traditional auxiliary ingredients common in Cantonese-style pastry. Alkaline concentration is very important, the concentration of alkaline water is too low, resulting in the addition of large amounts of alkaline water, will reduce the amount of syrup used in the dough, the moon cake dough will be "on the tendon", the product is not easy to return to the oil, back to the soft, and easy to deformation; alkaline water concentration is too high, will result in the surface of the moon cake coloring is too heavy, the alkalinity increased, the taste and texture of the taste deterioration.