A field experiment combined with the point observation method was conducted to study the relationship between the concentrations of mineral nutrient in the flowers and leaves of Nanfengmiju mandarin (Citrus kinokuni Hort.ex Tanaka) to determine whether flower analysis could be used for nutrient diagnosis.The results showed that concentrations of K,Ca and Mn in the leaves were significantly positive correlated with those in the flowers in two years.Concentrations of Mg,Cu and Fe in the flowers was significantly correlated with those in the leaves only in one year.Average concentrations of N,P,K,Mg,Fe,Cu and Zn in flowers were significantly higher than those in the leaves in 2011,whereas concentrations of the Ca,Mn and B in flowers were significantly lower than those in leaves.Average concentrations of N,P,K and Zn were significantly higher than those in leaves in 2012,whereas concentrations of Ca,Mg,Mn and B in flowers were significantly lower than those in leaves.Concentrations of Fe and Cu in flowers and leaves were not significantly different.Except the variation coefficients of concentrations of Fe and Mn in flowers in 2011 and concentrations of N,Cu and B in flowers in 2012,the variation coefficients of concentrations of other nutrients in flowers were lower than that in leaves.The best-fit curves were set up for concentrations of K,Ca and Mn,with the curve of K presenting exponential function relation,the curve of Mn presenting cubic function relation,and the curve of Ca presenting linear function relation ranged from 0 to 0.6% in two years.It is indicated that floral analysis as an early method could be used to diagnose the concentrations of K,Ca and Mn of Nanfengmiju mandarin (Citrus kinokuni Hort.ex Tanaka).