Objective To investigate the value of spiral CT three phase enhanced scan in the diagnosis of gastric stromal tumors. Methods A total of 31 patients with gastric stromal tumors treated in our hospital from January 2014 to December 2017 were selected, the clinical data and imaging data were collected, analysis of 31 cases of patients with gastric cancer CT scan and three phase enhanced CT scanning images, and the pathological examination results as the standard, compared with the detection rate, the accuracy rate between the CT plain scan and three phase enhanced. Results CT scan detection rate of gastric stromal tumors and the accurate diagnosis rate were 83.87%, 77.41%, the detection rate and the accurate diagnostic rate of three phase enhance CT were 100%, 96.77%, higher than that of CT scan. The difference was statistically significant (P<0.05). CT scan in 17 cases of gastric stromal tumor morphology showed round or oval, clear edge, clear boundaries with the surrounding tissue adhesion and invasion, no clear signs, no enlarged retroperitoneal lymph nodes. 14 patients showed irregular shape, growth into or out of the lumen, including 1 cases of patients with punctate calcification; three phase enhanced CT scan showed homogeneous enhancement in 6 cases, 4 cases of internal punctate uneven enhancement, progressive enhancement in arterial phase showed uneven enhancement and venous phase enhancement than arterial phase, to delay obviously continue to strengthen; 3 cases of patients with gastric cavity gas into the lesion gas shadow, no calcification. Conclusion Three phase enhanced CT scan can effectively display the image features of gastric stromal tumors, and it has high accuracy in the diagnosis of gastric stromal tumors.