The paper established a new way that the content of wheat grain phytic acid was determined by anllnoniilln ferric sulfate-bipyridine colorimetric method.It would get a good result under the experimental conditions in which the sample weight is 25 mg and the heating time is 30 minutes.The coefficient variation was between 0.92%-2.68% on 5 trials in 3 samples.The internal standard experiment showed that the average return-ratio of phytic acid was 97.3% approximately.The determination result was significant di...