The main method of using salt water for detoxification is to use 0.9% saline, which is the usual saline for infusion, and drink it warm in the morning after waking up. However, the premise of light saline detoxification is to combine the usual light diet, coarse dietary fiber diet and appropriate exercise after meals, and to develop the habit of regular bowel movements. The method of using light salt water alone is not effective, because the intestine contains a large amount of fat insoluble in salt water, food residues and stools need to be discharged through the peristaltic movement of the intestine. Not only salt water, but also plain water can increase the peristalsis of the intestines, but its effect is limited. It is not recommended to take warm salt water in people suffering from hypertension, heart disease and cerebrovascular disease, because warm salt water contains sodium ions, sodium ions can be excessive intake of water and sodium retention, which can aggravate hypertension, can induce heart disease and cerebrovascular disease.