The factors influencing the crystallization ratio of mold flux were researched by rapid cooling technology, and the factors affecting crystallization temperature were studied by single thermocouple technique. The results showed that the crystallization ratio of mold flux increases with the basicity and the content of Na2 O, CaF2,Li2O and NaF, and decreases with the increase of the content of Al2O3, MgO, BaO, MnO and B2O3. However,the crystallization temperature of mold flux rises with the basicity and the content of NaF, Na2O and CaF2, and reduces with the increase of the content of Al2 O3, MgO, BaO, MnO and B2O3. But for Li2 O, crystallization temperature decreases firstly to a minimum value at 2 %, and then increases gradually with the increase of Li2O.
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