Abstract: Obiective: To investigate the diagnosis and treatment of the collision carcinoma of bladder. Methods: Nine patients were retrospectively studied on the reviewof the literatures, including sex ratio, predilection sites, clinical situations and therapies. Results: The collision carcinoma of bladder was more common in males than in females and the predominant location was basilar part of the bladder. The clinical symptoms including gross hematuria, pollakisuria and urodynia. The preoperative biopsy was beneficial to diagnosis and operation was the major therapy. Conclusions: The collision carcinoma of bladder is a tumour of high malignancy and is rare in clinical cases. The prognosis is worse. The clinical features of the collision carcinoma of bladder need further investigation.