A simple method of atomic absorption apectrophotometric determination of chromium in ores was tested. The interference from iron and magnesium ions is solution was eliminated by adding suitable amonat of the restrainer solution(Na2SO4). This method must be free from chloride substance. The samples were sintered with sodium peroxide，and the leaching liquor was neutralized by adding 18 N sulfuric acid. The detection limit is 0.05 /ug/ml.