Is the 2022 men\’s and women\’s palace watch really accurate? With people\’s in-depth research on embryology and technology, the demand for gender selection is increasing, and the men\’s and women\’s uterine evacuation table has become a commonly used method among the people because of its simplicity and ease of use. However, what is the scientific nature of Qing Palace Tables? This article will introduce the scientific nature of Qing Palace Tables from four aspects. 1. Principle and history of Qing palace watch