After the navel is salted, it should be padded with ginger slices, which should be slightly thicker. Use a needle to punch some small holes in the ginger slices to facilitate the heat conduction of moxa sticks.

The navel, commonly known as "Xiadantian", is the place where essence and qi meet. The meridian theory calls the navel "Shenque point", which holds that it has the effects of warming meridians, dredging collaterals, harmonizing qi and blood, eliminating diseases, strengthening the body and prolonging life.

Applying salt to navel can adjust the function of viscera, promote metabolism, increase the number of white blood cells and red blood cells and the function of phagocytes, thus enhancing human immunity and improving health.