The Xi-Cleft acupoints are those located at the sites where qi and blood in the meridians converges and accumulates. There are sixteen such points on the twelve main meridians, yin link and yang link as well as yin heel and yang heel vessels. (See Table 4 - 7).
The Xi-Cleft acupoints are used mainly to treat acute diseases. For example, Liangqiu (ST 34), the Xi-Cleft acupoint of the stomach meridian, is selected to treat acute stomachache.