Shifting dullness is an important test to confirm the presence or absence of fluid in the abdominal cavity. The mechanism of percussion is that when a patient with fluid in the abdominal cavity is in the supine position, the fluid accumulates in the low part of the abdominal cavity due to gravity, and the intestinal tube containing gas floats on it, so the middle of the abdomen shows a drum sound on percussion, and the sides of the abdomen show turbid sounds. When the patient is in the lateral position, the fluid accumulates in the lower part, the intestinal tube floats upward, and the lower side of the abdomen turns to turbid sounds. Turbid sound is a non-musical percussion sound with higher pitch, weaker sound and shorter vibration duration, which is produced when percussing the parenchymal organs covered by a small amount of air-containing tissue, such as percussing the part of the heart or liver covered by the edge of the lung, or the percussion sound exhibited in pathological states such as pneumonia (reduced air content of lung tissue). Desirable diet: 1. Foods that can be easily absorbed and digested are desirable; 2. Foods rich in high-quality protein are desirable; 3. Seaweed-based foods are desirable. White radish: white radish is a dietary fiber food, easily absorbed by the intestine, but also has the effect of detoxification and moistening the stool, as well as diuretic to promote the role of ascites discharge, which is conducive to the recovery of patients. 200-300 grams per day is appropriate. Milk: Milk is rich in high quality protein and various mineral elements, which promote the absorption of intestinal nutrients, enhance immunity, supplement the role of albumin, and prevent hypoproteinemia. 350-500 ml per day is appropriate. Hot drinks are preferred. Kelp: Kelp contains a large amount of mannitol, which has a dehydrating effect and can promote the discharge of ascites and facilitate the recovery of patients. 200-300 grams per day is appropriate. Avoid eating diet: 1, avoid eating easily flatulent food; 2, avoid eating pickled food; such as salted eggs, salted meat, salted fish; 3, avoid eating indigestible food. Sweet potatoes: patients suffering from ascites abdominal distension, diet easily flatulent food, easy to aggravate the abdominal distension and pain, is not conducive to the recovery of patients. It is desirable to eat light and non-gas-producing food. Salty meat: salty meat contains a lot of salt, which can easily lead to water sodium storage slip, resulting in the inappropriate elimination of fluid, leading to an increase in ascites, which is not conducive to the recovery of patients. It is appropriate to eat light and low-salt food. Glutinous rice: glutinous rice is more difficult to digest food, easily lead to slow intestinal peristalsis, leading to intestinal distension, inhibit the absorption of nutrients, is not conducive to the recovery of patients. It is advisable to eat foods that are easy to digest.