Sewage sludge and waste tire scrap were co-gasified at 650 - 850°C in an internal circulating fluidized bed with a draft tube. The effect of bed temperature on the composition of two different product gases from draft tube zone and annulus reaction zone, and on the carbon conversion was investigated. Caloric value of the product gas from gasification of waste tire scrap is 15 MJ/m3 through the annulus zone at 800°C. Caloric value of the product gas decreases below 5 MJ/m3 when wet sludge is co-gasified. The entrainment of fine particles is large especially in the annulus zone for the waste tire gasification.