Purpose: To analyze the treatment results and detect the prognostic factors for primary gastrointestinal non-Hodgkin'slymphoma (PG-NHL) treated by various treatments. Materials and Methods: 54 PG-NHL patients (19 stage Ⅰ,23 stage Ⅱ, 6 stage Ⅲ and 6 stage Ⅳ patients) were treated from 1983 through 1992. After exploratory,45 patients had gastrotomy and 7, laparotomy. 43 patients were treated by postoperative radiotherapy or chemotherapy or both. Results: The 5-year survival rates ofⅠ～Ⅳ stage were: 94.7%?13.5% ,79.1%?12%, 80%?25.3% and 16.7%? 15.2%. The prognostic factors in PG-NHL were clinical pathologic stages, the volume of the primary tumor and single or multiple foci. Conclusion: Adequate initial surgery combined with postoperation adjunctive R in the upper abdomen for early stage Ⅰ and total abdomen for late stage Ⅰ and Ⅱ, which could be combination C+R following the incomplite resection or unresectable lesions , the tumor dose were 40～45Gy/5～6 wks and the CHOP- BLM program 4～ 6 cyles are benefit for PG-NHL.