Abstract:【ABSTRACT】Objective To discuss the curative effect of zoledronic acid and alpha D3 combined treatment in the aged with severe osteoporosis. Methods 120 patients were randomly divided into two groups, the treatment group (n=60) were taken Caltrate D added Zoledronic Acid and Alpha D3 treatment for 24 weeks, and the control group (n=60) received Caltrate D only. Results In the treatment group (excluded the drop-out cases), the bone pain eased faster than that of the control group(n=57), and the improvement of bone mineral density also significantly better than the control group (n=53) (P<0.05). The levels of plasma calcium, phosphorus in both groups, and alkaline phosphatase in the control group were no significant differences between pre and post treatment (P>0.05). But the alkaline phosphatase in the treatment group decreased significantly after treatment (P<0.05). Conclusion Zoledronic Acid combined Alpha D3 can significantly relieve pain and other symptoms, reduce bone mass lose, and improve bone mineral density of severe osteoporosis patients.