In The Book of Changes of Plum Blossoms, Shao Yong mentioned in his plum account that he could predict that a woman would pick plums tomorrow night because he used the method of plum divination.

Plum blossom occupation is a divination method based on plum blossom. According to the five elements principle of the Eight Diagrams, the good or ill luck of people can be inferred by observing the shape, color and quantity of plum blossoms. In Shao Yong's case, he may have found some signs or anomalies when observing plum blossoms, such as the abnormal number and color of plum blossoms, thus predicting that women will pick plum blossoms tomorrow night.

How Shao Yong decides tomorrow night instead of any other time may be related to his personal experience and judgment. The divination of plum blossoms requires the knowledge of five lines of gossip and heavenly stems and earthly branches, as well as a deep understanding of the growth, shape and seasonal changes of plum blossoms, so as to accurately infer the time and events. Therefore, Shao Yong may have made this prediction after comprehensively considering the observation of plum blossoms and his own experience.