Objective To discuss the clinical efficacy of transurethral electroresection in the treatment of ureteral orifice tumors. Methods A total of 65 cases of ureteral orifice tumor were treated with transurethral electroresection and chemotherapy.Results The operation time was 5~90 min(mean,35 min),and the intraoperative blood loss was 5~100 ml(mean,50 ml).No blood transfusion was required.No fatal case was encountered.Out of the 65 cases,there were 53 cases of transitional cell carcinoma(grade Ⅰ,43 cases;grade Ⅱ,10 cases) and 12 cases of papilloma.The 65 cases were followed for 6~24 months(mean,15 months).Postoperative urethral stricture happened in 4 cases,which were cured by dilation of the urethra.Recurrence of tumor at the trigone and lateral wall of the bladder occurred in 5 cases,which were given a re-operation of transurethral electroresection and chemotherapy and were followed for 10~20 months(mean,15 months) without recurrence.Conclusions Transurethral electroresection of ureteral orifice tumors gives satisfactory effects and should be further recommended.