Objective To explore the value of multi-slice spiral CT (MSCT) multiplanar reconstruction technique in the diagnosis and treatment of gastric cancer. Methods Sixty patients with pathologically confirmedgastric cancer who were admitted to the hospital between March 2013 and January 2015 were selected as study subjects. All patients underwent MSCT scan and multiplanar reconstruction scanning, and the results were compared with the results of pathological examination. Results The imaging findings of MSCT in the diagnosis of gastric cancer (location, size, shape, adjacent structures and distant metastasis of lesions) were typical.The accurate detection rates showed no significant difference between MSCT multiplanar reconstruction technique and results of pathological examination in early and advanced gastric cancer (P>0.05). The coincidence rates of MSCT diagnosis and pathological examination in T stagingof gastric cancer were T1 (75.00%), T2 (66.67%), T3 (86.67%) and T4 (81.82%). Conclusion The detection rate of MSCT multiplanar reconstruction technique is high in gastric cancer, and the coincidence rate with results of pathological examination is highin the diagnosis preoperative T staging, which provides important reference for preoperative evaluation and development of reasonable operation plan.