A study of rice milling under controlled atmosphere was conducted to reduce the oxidation which is the main factor of quality reduction in the rice milling process. Brown rice in five moisture levels was milled under the atmosphere of 1% O_2 and 99% N_2 composition in a box. The fatty acid content of milled rice under the controlled atmosphere was measured and compared with one under ordinary atmosphere. The fatty acid content of milled rice by CA rice milling was less than the conventional rice milling. Therefore, CA rice milling could be considered as an improved method of milling in terms of quality.