Objective To investigate the clinical value of spiral CT multi-phase scanning technique in early diagnosis of gastric cancer. Methods 88 cases confirmed by endoscopy for gastric cancer patients underwent CT scan and arterial phase, parenchymal phase and venous phase dynamic contrast-enhanced scan with multi-slice spiral CT, Analyze the imaging findings, and the disease and staging were diagnosed and compared with the results of surgery and pathology. Results 88 patients were scanned by spiral CT, the results showed that 88 lesions were detected, and the rate of spiral CT scan was 100% (88/88),there were no progressive gastric cancer in all patients. Compared with the pathological staging examination, the overall accuracy rate of CT staging for gastric cancer with spiral TNM was 80.68%.Among them, the judgment accuracy of ≤T2 phase was 87.50%, the judgment accuracy of T3 phase was 74.36%, and the accurate rate of T4 phase was 84.01%. Overall, multislice spiral CT in early gastric cancer (T2) in the diagnosis accuracy rate is relatively high. Conclusion Spiral CT multi-phase scanning technique is of high accuracy for early diagnosis of gastric cancer, the utility model has the advantages of simple operation, no trauma and wide adaptation to people, and can provide image data for clinical operation, and has important clinical application value.