The attrition characteristics of PKM1-SU particles, which are absorbents for pre-combustion CO2 capture, were investigated under various experimental conditions by varying the test apparatus, static bed height, temperature, pressure, gas velocity, and humidity. A fluid catalytic cracking (FCC) catalyst was used as a reference material for comparison. In this study, the attrition characteristics caused by the gas jets of the distributor were evaluated using a conventional ASTM D5757-95 attrition test apparatus and a newly designed high-temperature and high-pressure bubbling fluidized bed attrition test apparatus. The attrition amount (or rate) of particles (PKM1-SU and FCC catalyst) increased with increasing pressure and gas velocity, whereas it decreased with increasing static bed height and temperature. The attrition characteristics of the FCC catalyst were not affected by humidity, whereas those of the PKM1-SU particles were strongly affected. The attrition rates of PKM1-SU were higher during the early period (1 h) than during the later period (2-5 h). Therefore, both the corrected weight loss index at 5 h and the weight loss index at 5 h should be considered.