Hydroxyapatite powder were synthesized by precipitation method, varying pH, and reaction temperature. The powders were heated at 1,200$^{circ}{cdots}$ and 1,300$^{circ}{cdots}$ for fabrication of dental prosthesis. The results are as follows: Synthesized powder showed the smallest particle in size, under the conditions of pH 11 and reaction temperature 37$^{circ}{cdots}$. The hydroxyapatite was partially converted to $alpha,;eta$-TCP at 1,200$^{circ}{cdots}$ and 1,300$^{circ}{cdots}$. Mechanical strength of sample was affected by such powder preparation conditions as pH and reaction temperature and sintering temperature. The mechanical strength of sample prepared under the same conditions was increased with increasing pH, reaction temperature and sintering temperature.