This part specifies the Titrimetric method for the determination of the content of oxidation calcium and oxidation mg in the slag containing vanadium and titanium. It is suitable for the determination of the content of oxidation calcium and oxidation mg in the slag containing vanadium and titanium. The determination range is calcium oxidation ≥ 1.50% and oxidation mg is 1.00% to 20.00%. After the sample is melted with sodium oxidation, iron, titanium, manganese, aluminum, silicon and other interfering elements are separated, and the content of oxidation calcium and oxidation mg is titrated under specific conditions. Approved analytical pure reagents and distillation water or water of equivalent purity should be used in the analysis, in accordance with the provisions of GB/T 6682.