Abstract:The contents of polyphenols，flavonoids and antioxidant activity in seven kinds of citrus peels and pulp were compared.The results showed that there were significant differences in polyphenols content（TPC）and flavonoids content（TFC）in these citrus peels and pulp.The TPC and TFC of citrus peel were in the range of 24.77 mg GAE/g-47.48 mg GAE/g and 10.47 mg CE/g-22.11 mg CE/g，respectively，and the highest TPC and TFC were both found in Tarocco blood orange peel.In the citrus pulp，the TPC and TFC in the range of 0.43 mg GAE/g-0.75 mg GAE/g and 0.29 mg CE/g-0.63 mg CE/g，respectively，and the highest TPC and TFC were found in Jinhong bingtang orange pulp and Jinmi bingtang orange pulp，respectively.The three antioxidant activities of DPPH·，ferric reducing antioxidant power（FRAP）and ABTS+·in citrus peels were 2.41 μmol TE/g-7.90 μmol TE/g，15.38 μmol TE/g-54.76 μmol TE/g and 28.11 μmol TE/g-46.46 μmol TE/g，respectively.For citrus pulp，the DPPH·，FRAP，and ABTS+·antioxidant activity were 6.95 μmol TE/g-20.21 μmol TE/g，2.40 μmol TE/g-8.10 μmol TE/g and 8.55 μmol TE/g-20.90 μmol TE/g，respectively.It was found that the strongest of antioxidant capacity were Taro blood orange peel and pulp.Furthermore，these seven kinds of citrus species were classified four groups by using principal component analysis and cluster analysis，seven different species of citrus were divided to four groups.