Abstract: Oxidizing-roasting process of chromite is divided into calcium roasting，less calcium roasting，and non-calcium roasting.However，the raw material ratio of chromate manufacturers is confidential，so it is very difficult to determine that the production process is a calcium roasting or non-calcium roasting.After years of production practice，the determination condition of oxidizing-roasting process was summarized，that is，leaching residue of calcium distribution coefficient（the ratio of calcium oxide actual loaded and theory loaded），hexavalent chromium content in leaching residue，concentration of soluble SiO2 and Al2O3 in the leaching solution，alkali utilization ratio，and leaching residue quantity.The research is helpful to realize the adjustment of the industrial chromate structure.

Key words: chromite, roasting process, determination, evaluation