PURPOSE: To reduce the amt. of waste liquid in the development of silver halide photographic sensitive material by replenishing antimolded water to a washing tank or a stabilizing tank, and utilizing the overflowed liquid of the washing tank or the stabilizing tank for the diluting liquid of concd. fixing liquid.

CONSTITUTION: The stock water treated by an antimolding means and stored in a stock tank 4 is utilized as diluting water of concd. developing liquid, and utilized at the same time as replenishing water for washing water or stabilizing water in the washing treatment requiring ≤3l, pref. 50ml-1l water per 1m2 photosensitive material. Both of the diluting water for development and the replenishing water for washing are supplied from a same stock tank. A part or whole of the overflowed liquid of the washing water contg. the stock water for replenishment is transported to a fixing liquid tank 2 and utilized further as diluting water of concd. fixing liquid. The replenishment and transportation of the stock water and the concd. treated liquid are preferably performed automatically as the progress of the treatment of the photosensitive material. By this method, the waste washing water is utilized effectively, and diluting water for fixing liquid is saved at the same time.