Abstract: Objective to explore the characteristics of gastric myoelectrical activity induced by meal in obese people. Methods 41 cases of obese subjects were investigated with Digitrapper electrogastrography(EGG) before and after test meal，32 healthy volunteers with normal body mass index were studied as control. Results before meal, the percentage of normal slow waves(N%)in obese group was lower than that in control subjects(55.52±15.7 vs 70.83±14.31, P<0.05); the percentage of bradygastria (B%) and the percentage of arhythmia (AR%) in obese group were higher than those in control group respectively (17.07±10.88 vs 11.46±8.86, 9.70±5.7 vs 5.75±4.14,P<0.05 and P<0.01). ②after meal, N% in the obese was lower than that of the control group (53.19±17.77 vs 64.34±22.63, P<0.05);DP and the percentage of tachygastria(T%) in the obese were higher than those in control group respectively (36.50±4.86 vs 32.24±6.25, 19.93±11.62 vs 12.94 ±11.72,P<0.01 and P<0.05). ③the increase of DP, amplitude and power ratio (PR) in the obese were significantly higher than those in control group (P<0.01 and P<0.05).Conclusion At fasting state and post-meal state, obese people have abnormalities in gastric myoelectrical activity. Abnormal gastric electrical activity and DP'increase after meal may be electrophysiological basis of gastric hypermotility in obese people.