The present invention relates to a new diphosphonate compound, and the method to prepare the above new diphosphonate compound. The new diphosphonate compound provided in this present invention exhibits an activity in inhibiting osteoclast equivalent to alendronate sodium, and a higer activity in affecting the proliferation of osteoplast than the positive control compounds, but the positive control exhibits a weaker effect on osteoblast proliferation. In experimental examples, an administration schedule for the diphosphonate compound of the present invention is provided.
