It is evident that oxygen carriers play a pivotal role in the chemical looping combustion. Although the majority of studies have concentrated on enhancing the high-temperature thermal stability and reactivity of oxygen carriers,it is imperative to study the attrition behaviors of oxygen carriers precisely. In this work,a micro fluidized bed thermogravimetric analysis (MFB-TGA) was developed to obtain the attrition properties through real-time measurement of weight changes during the redox reactions. Ilmenite, iron ore, and laterite ore were selected as the oxygen carriers, and the contributions of mechanical, thermal, and chemical stresses to oxygen carrier attrition were investigated. It was found that ilmenite and iron ore started stable attrition just after the 20th and 5th cycles due to the activation phenomenon. Laterite ore suffered a fast attrition stage with a rate of 0.37 % h⁻¹ before the 20th cycle, after that, the attrition rate changed to be slow. At the end of activation, ilmenite and iron ore attrition was led by mechanical stress with the proportion of ∼40 %, while chemical stress was the predominant factor of laterite ore attrition with the proportion of ∼57.6 %. The proposed micro fluidized bed thermogravimetric method provides an effective and convenient pathway to determine,evaluate,and compare the attrition behavior of oxygen carriers in laboratory.