In Japan, UICC TNM staging system is widely accepted and used for clinical and pathological classification of prostate cancer. "General rule for clinical and pathological studies on prostate cancer" was also edited by Japanese urological association and the Japanese society of pathology. In this book, clinical staging system modified from Jewett staging system is demonstrated. Though both staging systems are widely used in clinical practice to select treatment and speculate prognosis after treatment, there still exists many limitations and unreasonable problems that must be solved in the future. In this paper, these staging systems with their specific problems and new grouping trials will be introduced.