A mobile turbid sound is a sign that indicates the presence of fluid in the patient’s abdomen. In normal people, there is no accumulation of fluid in the abdominal cavity. If there is an accumulation of fluid in the abdominal cavity, let the patient take a flat position, you can percuss from the umbilicus to the left side, when the drum sound changes to a turbid sound, then let the patient lie on the right side, at this time the site of the turbid sound becomes a drum sound again, from this position gradually percuss to the right side, when the drum sound changes to a turbid sound again, let the patient take a flat position, at this time when percussing again, the turbid sound becomes a drum sound again. This indicates that as the body moves from left to right position, the water in the abdomen moves with it, indicating the presence of fluid in the abdominal cavity, which is the significance of the mobile turbid sound.