This study is based on the clinical analysis of 18 cases with primary maligmant lymphoma of the gastrointestinal tract treated at Kyung Hee medical Center during about 10 year-period frome January, 1975 ta November, 1985. The result were as follows. 1) The age incidence was prevalent in the middle age group and the ratio of male to female was l. 5: 1. 2) The most cammon symptom and sign were abdominal pain and weight loss. 3) Among the 18cases, 7 of the malignant lymphoma arose in the small bowel, 6 in the stomacb, 3 in the large colon, in the metastatic malignant lymphoma. 4) They were diffuse histiocytic type in the 10 cases, diffuse mixed type in the 4 cases, 5) Curative surgery was performed in 12 cases, palliative in 2 cases, by-pass procedures in 2 cases and biopsy only in 2 cases. Postoperative chemotherapy was performed in 3 cases, radiation was perfamed 3 cases, combination therapy was perfomed in 1 case. 6) The immediate postoperative death occured in the 2 cases, The cause of death was sepsis.