Hydroxyapatite is considered as one of the most effective biomaterials with general formula Ca10 [PO4]6[0H] 2 , many substances have been used for doping hydroxypatite like F, Mg, CO3, Zn, Bi and Na ,to improve the properties of the HA crystal . In this paper, we discuss the influence of magnesium ions on the electrical properties of the HA crystal . HA (S1) and Mg loaded hydroxy apatite (S2,S3 and S4) of different magnesium concentrations have been prepared by wet precipitation method. The dielectric parameters (ε' ) and (ε'') measured at different temperature, relaxation time of relaxation process was calculated from the cole cole plot . The advantages of modulus studies were to recognize the conduction process and study the effect on the frequency and estimate the relaxation frequency. Conduction mechanism has been studied using alternating current measurements, analyzing their dependence on temperature and frequency. The exponent (S) was estimated to recognize the type of conduction. The activation energy studied also to confirm the conductivity measurements . The electrical measurements confirmed that as the addition of Mg increased , the conductivity of the substance would increase and this will improve the bioactivity of HA .