Abstract: Six major flavonoids in 15 citrus varieties' peels were determined by HPLC(High Performance Liquid Chromatography),as well as their antioxidant capacity by 4 antioxidant methods(DPPH assay,FRAP assay,metal chelating capacity assay,and TBARS assay). The results showed that PMFs(Polymethoxylated Flavones)were richest in Ponkan(nobiletin was 9.01 mg/g DW,and tangeretin 5.10 mg/g DW),and Satsuma mandarin had the highest content of narirutin(10.83 mg/g DW),hesperidin(56.74 mg/g DW),and total flavonoids(sum of the 6 flavonoids:68.26 mg/g DW). Meanwhile,most citrus peel extract exhibited high antioxidant capacity determined by 4 different antioxidant assays. The result of FRAP assay and DPPH assay had significant correlation( p <0.05), and no significant correlation were observed with metal chelating capacity assay and TBARS assay(p>0.05).