4-bis(dihydroxy phosphonyl) pentane (DHPP) were synthesized and were labelled by ~99mTc.The influencing factors were studied and the best labelling procedures.were obtained.The biodistribution of ~99mTc-DHPE
99mTc-DHPB and ~99mTc-DHPP in mice wereevaluated. The results of the biodistribution show significant accumulation of all theabove three ligands in mouse bone.