New application method of ultrasonic probe to diagnosis of digestive organs was deviced by the author. The special ultrasonic probes for this study have been designed and producel by the author. Transdnsducers with barium titanate ceramic vibrator (2.25MC) and 10mm or 7mm in diameter have been used at the tip of the flexible probes. Probes are 2～3m in length and 5mm in diameter and can be rotate in all directions in the oesophagus, stomach, rectum and discending colon. Clinically, digestive organs would be examined by transoral or transanal application of these probes. In the experimental and clinical studies, the ethos from the vagus, heart and mediastinum were obtained from the probe which was located in the oesophagus: the echos from the liver, gall bladder, diaphragm, pancreas, spleen and retroperitoneum were obtained from the probe which was located in the stomach; the echo from the urinary bladder, small intestine and kidney were obtained from the probe which was located in the descending colon. In the clinical studies, the echos from the heart, aorta and inferier vena cava showed pulsating, fine and multiple wave form; the echos from the cancer tissues, scharp and multiple wave form; the echo from the diaphragm, sharp wave form and movable by respiration.