The study was made of sound waves effect on duodenal motility (DM) in 60 chronic sufferers with duodenal functional ileus. The exposure to 2.0-3.0 kHz sound waves of 0.57-0.73 W/cm2 intensity promoted intestinal contractions, duodenal passage of barium, enhanced biopotential, amplitude and tone. These parameters tended to acquire values similar to duodenal motility in health.