Abstract: This paper adopts co-precipitation method to prepare Ce-doped YAG precursor. In order toobtain the pure YAG powder, this experiment uses CeO₂、Y₂O₃、Al(NO₃)₃·9H₂O and NH₄HCO₃ as raw materialsto prepare YAG:Ce³⁺ precursor in different precipitation temperature and high-temperature calcination. Theeffects of precipitation temperature on properties of YAG:Ce³⁺ powder are analyzed by means of TG/DTA, XRD and spectrum analysis. The results show that the YAG :Ce³⁺ powder prepared under the precipitationtemperature of 25 ℃ boasting good luminous intensity.