The pattern and the time of gastric emptying were investigated in 38 patients with peptic ulcer and 7 healthy volunteers using the double-sampling method. The pattern of gastric emptying assumed the following three attitudes, that is, exponential (44%), quadratic (29%) and unclassified (27%) pattern. These patterns appeared to depend on the distance from the gastric angle to the pyloric ring measured from X-ray pictures in the upright position. There was no significant difference in the gastric emptying time in patients with peptic ulcer according to its site. During follow-up observations of the same case, the gastric emptying time had a tendency to shorten in patients with duodenal ulcer while it showed no definite variation in patients with gastric ulcer.