Abstract: Objective: To discuss the treatment for incidental renal cell carcinoma.Methods: Twenty-two patients with incidental renal cell carcinoma underwent the nephron-sparing surgery.Among them,17 patients had normal opposite kidney,2 patients had damaged or potential disfunctional opposite kidney,1 patient had congenital isolated kidney,1 patient had tumor in his transplanted kidney and 1 patient had von hipple-Lindau's syndrome.Results: All the patients were followed up for 6 to 62 months.Only 1 patient had a relapse.Conclusions: Nephron-sparing surgery is an effective procedure for treatment of incidental renal cell carcinoma.