To greatly save washing water without impairing picture quality preservation and collecting silver in photograph treatment.

When silver halide white-black photograph material is passed through a treatment machine which has plural treatment tanks including a developing tank 1, a fixing tank 2, one or more washing tanks 3, 4 and a stabilizing tank, a speed for washing liquid or stabilizing liquid to be added to at least one of the washing tanks 3, 4 and the stabilizing tank is changed as the function of the concentration of silver ions or halide ions in at least one of the washing tanks 3, 4, the stabilizing tank and the fixing tank 2.