In this paper a new approach so-called photolytic silver method is presented for getting a silver-particle phase hologram by bleaching an amplitude hologram into a silver-chloride hologram first and then exposing it to a beam of strong light. Using Tianjin type-I holographic plates, the maximum efficiency of 28 % has been achieved and the hologram is photostable. The fact that the electron microscopic images show that the dimension of photolytic silver particle reaches a limit, of 0.01 μm appears to explain the cause of increasing the diffraction efficiency.