Purpose: To determine the clinical and pathological risk factors for subsequent bladder tumor in patients with primary upper tract urothelial tumor, we retrospectively analyzed patients with upper tract urothelial tumor, focusing on the clinicopathological features of subsequent bladder tumor. Materials and Methods: Risk factors, disease free rate and survival were assessed with clinicopathological features in 56 patients with upper tract urothelial tumor operated between 1989 and 1998. We excluded the patients with lymph node metastasis or distant metastasis, those with a short period of follow-up, and those having a previous history of bladder tumor. Risk factors such as sex, age, location of tumor, size of tumor, number of tumor, synchronous bladder tumor, preoperative urine cytology, stage, grade, operation method, and adjuvant chemotherapy were investigated.