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Objective: The aim of our study was to probe into the effect of fluorouracil controlled release formulation in the local implant treatment of patients with advanced colorectal cancer. Methods: Sixty-four cases of patients advanced colorectal cancer from August 2004 to February 2008 were selected for radical surgery, including 32 cases injected with intraoperative fluorouracil controlled release formulation in local implantation for 600 mg (the treatment group). Patients in another 32 cases received abdominal washing surgery by distilled water (the control group). All patients were followed up for 2 years and observed in aspects of the toxicity, 2-year survival rate, local recurrence rate and distant metastasis rate. Results: The 2-year survival rate and local recurrence rate in the treatment group was better than those in the control group (P ＜ 0.05); as for toxicity and distant metastasis rate, no significant difference was observed. Conclusion: The effect of fluorouracil controlled release formulation in local implantation treatment was significant and the patient tolerance was satisfactory. Thus, it is an effective approach in the treatment of advanced colorectal cancer.