Abstract： Objective　To investigate helical CT enhancement characteristics of gastric carcinoma, and the diagnostic value and preoperative staging of gastric carcinoma with triphasic incremental helical CT of the stomach with water-filling method.Methods　Both double-contrast barium examination and triphasic incremental helical CT of the stomach with water-filling method were performed in 46 patients with gastric carcinoma.Results　(1) Among these patients, normal gastric wall exhibited one layered structure in 18 patients, two or three layered structure in 28 patients in the arterial and portal venous phase. (2) Two cases of early stomach cancer showed marked enhancement in the arterial and portal venous phase and obvious attenuation of enhancement in the equilibrium phase.On the contrary, 32 of the 44 advanced gastric carcinoma was showed marked enhancement in the venous phase compared with the arterial phase ( t=4.226, P<0.05). (3) The total accuracy of triphasic incremental helical CT in determining TNM-staging was 81.0%.Conclusion　Different types of gastric carcinoma have different enhancement features. Triphases incremental helical CT is more accurate than convertional CT in the preoperative staging of gastric carcinoma.