Abstract: The effects of cooling system and raw material mixture ratio on the phase composition, self-disintegrating behavior and Al₂O₃ leaching behavior were investigated by XRD, a laser particle size analyzer and chemical analyzer. The results indicated that the key temperature range was between 1200 and 1500 ℃ for phase composition with 5 ℃ /min cooling rate, and the Slag condensation was over and the phase composition had no change under 1200 ℃, the main phases were Ca₁₂Al₁₄O₃₃ and r-Ca₂SiO₄.The self-disintegrating and leaching behavior of the slag became better, and the self-disintegrating rate was more than 90 % and the leaching rate was more than 80 % when A/S(the quality ratio of Al₂O₃ to SiO₂)was 0.5~1.5 and C/A(the molar ratio of CaO to Al₂O₃)was 1.5~1.8.