Abstract: The extraction process of phytic acid from foxtail millet brans was optimized through respond surface method.The optimal condition was:solution/sample ratio 14∶1 (v/w, mL/g) , extraction time 68min, and extraction temperature 34℃.Phytic acid in foxtail millet brans was extracted under the optimal condition mentioned above, and each phytic acid extract from 38 different foxtail millet brans was determined by colorimetric method respectively.The content range was 3.13⁸.75mg/g.Phytic acid content in DC foxtail millet brans was relatively high, and in Jingu foxtail millet brans was relatively low and also volatile.Phytic acid content in different foxtail millet bran strains, and in different foxtail millet bran varieties of the same strain were quite different, for which the possible reason was that phytic acid content was a combined effect of both genetic factors and growing conditions.