Abstract: The influencing factors of the decomposition of the scheelite and wolframite mixture ore by NaOH were studied. Through the experiments, the optimal technique conditions were determined: temperature was 180 ℃, liquid-solid ratio was 0.8 :1, alkali quantity was 1.6, agitation speed was 550-650 rpm, holding time was 2 hours, additive content was 1.5-2.0.