The amounts of dissolved silver bromide and silver chloride disc with thiocyanate or thiosulfate solution were measured by gravimetric method. At the constant agitation speed (2, 500 rpm), the amount of dissolved silver bromide disc with 1 M ammonium thiosulf ate solution was more than that with 2 M ammonium thiocyanate solution at 25°C, but the above mentioned order on the dissolved amounts was reversed at 5°C. The amounts of dissolved silver halide with 1 M ammonium thiosulf ate solution were more than that of 2 M ammonium thiocyanate solution for 1, 000-4, 000 rpm agitation speeds at 25°C. The dissolving speed of silver halide disc with the solution was found to be first-order up to a certain dissolving time. The value of activation energies for dissolving with silver halide disc were obtained 5-7 kcal/mol by ammonium thiosulfate and also 3-6 kcal/mol by ammonium thiocyanate. From these results, it was indicated that the dissolving of silver halide disc with the fixing solution was diffusion controlled at lower agitation speeds.