To provide a processing solution for a silver halide photographic sensitive material which causes no change to sensitivity and gamma independently of storage conditions and a preparation method and ensures good stability of sensitivity and gamma in running even when used as a development replenisher solution and to provide a processing method.

At least, one of a developing solution and a development replenisher solution as processing solutions for a silver halide photographic sensitive material used in a developing step when developing, fixing, washing (stabilizing) and drying steps for the sensitive material are carried out using an automatic processing machine is prepared by diluting a powdery developing composition vacuum-sealed in two layers of powdery materials in a packaging material with water.