Objective To analyze the image contrast of CT and MR in Primary gastric lymphoma. Methods A retrospective analysis of our hospital clinical data of patients with primary gastric lymphoma, CT and MR imaging findings was organized. Results Extent of disease in primary gastric lymphoma, location and the surrounding lymph nodes were clearly showed with CT and MRI. Three cases were involved the stomach near the body, 7 cases were involved the gastric body and antrum, 6 cases were involved the gastric fundus, 3 cases were involved the gastric body and gastric antrum, 3 cases were involved the cardia and fundus.Patients were appeared gastric wall thickening situation, three patients were serosa fuzzy by CT diagnosis, 6 patients serosa were blurred by MRI diagnosis.20 patients were CT scansed with with mild homogeneous enhancement,2 patients were severed with heterogeneous enhancement,11 patients were MRI diagnosised enhancements, including 9 cases even slightly enhanced, 3 cases moderate heterogeneous enhancement.DWI signal appears were highlighted signal of all patients, highlight the tumor and lymph node metastasis sorghum signal. Conclusion Primary gastric lymphoma CT and MR imaging findings certain characteristics, in combination with the diagnosis of a higher value.