Abstract:This subject adopted the wet digesting-flame atomic absorption spectrophotometry to determine the total iron content and the iron content in starch，protein，and residue of the Elian No.5 lotus root in different month.The annual dynamic variation of the total iron content in the Elian No.5 lotus root was explored，and the iron occurrence form was analyzed.The results showed that during the annual growth period of Elian No.5 lotus root，its total iron content and the iron content in starch and residue increased first and then decreased，reaching the maximum in August.In the whole year，the iron content in the protein of lotus root reached the highest in January with great fluctuation，but showed a downward trend as a whole.The annual iron content of Elian No.5 lotus root was at a high level，ranging from（35.60±1.41）mg/kg to（116.40±2.86）mg/kg，higher than that of rice，potato，spinach，and so on.The range of annual iron content in the starch，protein，and residue of lotus root were（35.19±1.74）mg/kg-（126.51±3.13）mg/kg，（100.12±7.09）mg/kg-（393.31±9.25）mg/kg，（50.34±1.95）mg/kg-（170.73±2.35）mg/kg，respectively.In the whole year，the starch iron was the main occurrence form of iron in the lotus root，accounting for 36.02%-67.32%of the total iron content，which was higher than the protein iron，residue iron，and inorganic and other organic iron.