Between Sep. 1986 and Mar. 1996, twenty four patients with recurrent giant cell tumor of their long bones were treated and followed up for more than two years. We applied three different modalities for treatment: curettage with bone graft, curettage and packing with polymethylmethacrylate, wide excision with or without reconstruction. During the average 51.5 months after operation(24-97 months), two of three patients who underwent curettage with bone graft showed recurrence. Patients who underwent wide excision showed no recurrence. Five of fifteen patients who underwent curettage and packing with polymethylmethacrylate showed recurrence. Four of seven who showed recurrence were treated with reapplication of curettage and packing with polymethylmethacrylate. All four patients showed no recurrence, and two of them have been followed up for more than two years. We suggest that the curettage and packing with polymethylmethacrylate is an effective treatment modality of the recurrent giant cell tumor.