Abstract: The experiment was conducted to determine the contents of inorganic elements including Ca, S, P, K, Mg, Na, Fe, Cu, Mn, Zn, Co, and Mo in formula feed from Ningxia University by ICPAES using high pressure systemsealed microwave digestion. The sample of feed was digested with HNO3H2O2 acids system. The operation would be simplified, and the blank value would be decreased following the above measures. This study showed that the relative standard deviation was below 5% for all the elements. The recovery was between 94.7% and 114.3% by adding standard recovery experiment. This study found that the method of sealed microwave digestion ICPAES was sensitive, precise, easily operational and rapid on the determination of inorganic elements in animal formula feed, satisfying the sample examination requirement, which would provide useful technology for determining the contents of mineral elements in animal formula feed, and the application of mineral additive in animal production.