Methanolic extracts from ten fruits were examined for anthocyanin, flavonoids and phenolic acid constituents, and antioxidant capacity. The fruits included: mao luang (Antidesma bunius Linn.), mao khipla (Antidesma ghaesembilla Gaertn.), mulberry (Morus alba Linn.), wild grape (Tetrastigma quadrangulatum), red grape (Vitis vinifera), blueberry (Vaccinium myrtilus), strawberry (Fragaria ananassa), red raspberry (Rubus idaeus), cherry (Prunus avium), and black currant (Ribes nigrum). The RP-HPLC-DAD method was used for the simultaneous analysis of flavonoids and phenolic acids in fruits. The results showed that the highest anthocyanin and total phenolic contents were found in Mab khaipla, mulberry, and mao luang. The antioxidant activity was measured from 1.EC₅₀^-1 by the DPPH method. Mao khaipla and mao luang had the highest radical scavenging activity. The correlation coefficients exhibited a high positive relationship between total phenolic and anthocyanin contents in the berry extracts and scavenging activity.