Osteoporosis(OP)is associated with high risk for cardiovascular disease(CVD). Concomitant occurrence of both OP and CVD seems to result from common pathological mechanisms between bone system and vascular system. It is expected that therapeutic agent for OP may be effective not only in normalization of bone metabolism but also in reducing vascular calcification. I give an outline with the relationship between bone metabolism and vascular calcification including epidemiology, outbreak mechanism, and effect on vascular calcification of OP treatment.