This proposed research project is about development of new bone-targeting drug called PTHPEG- BP, this new compound will overcome shortages of current clinical peptide hormone PTH, and show better treatment efficacy and lower price then the latter; several new technologies will be used on research of this PTH, such as micro Positron Emission Tomography (PET/CT), and several of its characteristics will be identified such as structure, bioactivity, and metabolism inside body.