Objective To explore the safety of fluoreuracil implanting to abdominal cavity during operation of advanced colonic cancer patients, search for new approach for preventing from local relapse of colonic cancer. Methods Divide 60 patients accepting radical colonic cancer surgery into 2 groups, treating group and control group. Treating group are implanted of fluorouracil along the wounded surface of tumor and draining path of lymph nodes. To observe the curing of wounded surface, stomal leak ,wound infection, intestinal obstruction and hospital day. Results There is no significant differences between treating group and control group in stomal leak,wound infection, intestinal obstruction and hospital day (P>0.05). Conclusion It is safe to implant fluoruuracil during radical colonic surgery, which is an effective path of regional chemotherapy after operation.