Abstract: In the field of automatic boiling in a pan in which the consistency of massecuite is controlled in accordance with method steps, intermittent boiling is used as an effective way to improve the boiling time and quality of products with supplying of appropriate amounts of water or solution into the pan to control the consistency each time it has reached a set value. This invention provides a novel method for controlling the consistency of the massecuite, wherein two curves are established defining the upper limit and lower limit, respectively, of an allowable range of consistency and within which the consistency is maintained, whereby a product of high quality is obtained safely, simply and within a minimum amount of time.