Abstract: To improve the gasification effect of sewage sludge, experiments on chemical looping gasification (CLG) of sewage sludge were conducted in a fluidized bed using hematite as the oxygen carrier, so as to analyze the effects of O/C ratio, gasification temperature, steam content on the sludge gasification characteristics, and to study the physical and chemical properties of hematite in the process of continuous cycling. Results indicate that hematite can markedly enhance the gasification degree and carbon conversion rate of sewage sludge with increasing O/C ratio, the concentrations of CO and CH₄ in the syngas decrease, whereas that of H₂ firstly decreases and then increases. With the rise of gasification temperature, there is a gradual increase of CO and H₂ volumetric fraction, but a gradual decrease of CO₂ and CH₄ volumetric fraction, with a constant improvement of carbon conversion rate. The increase of steam content would lead to the decrease of CO and CH₄ volumetric fraction and to the increase of CO₂ and H₂ volumetric fraction in the syngas, as well as to the increase of carbon conversion rate. The hematite shows good reactivities in long-term operation periods.