NOVELTY - A smoke circulation gasification furnace of fixed bed comprises a garbage, a biologic substance, and coal gasification technology; where the smoke circulation outlet (2) of the gasification reaction furnace (23) is connected to a combustion area (VI); the gasification reaction furnace is fixed bed gasification furnace; the gasification reaction furnace is provided with a water vapor mixture area (I), a drying area (II), a thermal decomposition area (III), a reduction area (VII), and a combustion area that are all connected; and the drying area is located below the water vapor mixture area.    USE - The smoke circulation gasification furnace of fixed bed is useful for processing city life garbage, agriculture and forest salvage, and coal gasifying.    ADVANTAGE - The smoke circulation gasification furnace of fixed bed improves gas quality, and makes use of more than 1000 degrees C in the combustion area to thoroughly disintegrate toxin dioxin. transfers garbage, agriculture and forest salvage to secondary clean energy. Moreover, it changes waste to treasure, it not only eliminates garbage pollution, but also eases energy crisis, and does not discharge smoke and adopts smoke circulation to gasify. Additionally, it not only reduces atmosphere pollution, but also avoids heat losing for exhausting smoke and heat losing for gas incompletely burning; thus, it improves conversion rate of material.    DETAILED DESCRIPTION - A smoke circulation gasification furnace of fixed bed comprises a garbage, a biologic substance, and coal gasification technology; where the smoke circulation outlet (2) of the gasification reaction furnace (23) is connected to a combustion area (VI) through the smoke circulation loop; the gasification reaction furnace is fixed bed gasification furnace; the gasification reaction furnace is provided with a water vapor mixture area (I), a drying area (II), a thermal decomposition area (III), a reduction area (VII), and a combustion area that are all connected; the water vapor mixture area is on the most upper position of the gasification reaction furnace; the drying area is located below the water vapor mixture area; the thermal decomposition area is located below the drying area; the reduction area is below the thermal decomposition area; and the drying area is located below the water vapor mixture area.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the smoke circulation gasification furnace of fixed bed.    Smoke circulation outlet (2)    Gasification reaction furnace (23)