NOVELTY - The method involves pulverizing the carbonized-material (4) for combustible pyrolysis gas while sending to two-stage gasifier (7). The combustible pyrolysis gas (3) is emitted at the time of the carbonization process of the biomass fuel (1) while carrying out the carbonization process of the biomass fuel and generating carbonized-material to micron order so as to produce fine-powdery carbonized-material (4'). The combustible pyrolysis gas is reformed and combustible gas (11) is generated while supplying fine-powdery carbonized-material to gasifier.    USE - Carbonization/gasification method of biomass fuel from raw material such as wood type biomass, municipal solid waste, agriculture-and-forestry resources, agriculture-and-forestry residue, construction waste material, livestock farming and marine resource, livestock farming and marine residue, foodstuff waste material, sludge, and mixing biomass.    ADVANTAGE - The gasification performance of the carbonization/gasification system is improved by generating combustible gas with high-level quality. The biomass can be gasified stably and continuously. Since the water content in biomass fuel is reduced, the water content contained in the combustible pyrolysis gas emitted in the carbonization process of biomass fuel is reduced. Since the oxygen enrichment operation can be performed within gasifier and the temperature in gasifier can be maintained at high temperature, the improvement of the gasification performance is achieved. The utilization of fuel with the low emitted-heat amount or watery fuel is enabled. Since the size of carbonized-material is kept finely and constant, the carbonized-material is uniformly spread over the whole inside of gasifier.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for carbonization/gasification system of biomass fuel.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the carbonization/gasification system of biomass fuel.    Biomass fuel (1)    Combustible pyrolysis gas (3)    Carbonized-material (4)    Fine-powdery carbonized-material (4')    Two-stage gasifier (7)    Combustible gas (11)