Iris tectorum Maxim. extract is a cosmetic raw material approved by the state,various types of cosmetics containing I. tectorum extract appear in the domestic market.In order to compare the antioxidant capacity and tyrosinase inhibition activity of different parts of I. tectorum in vitro,DPPH radical scavenging capacity,hydroxyl radical scavenging capacity,the total antioxidant capacity (T-AOC) and the inhibition rate of tyrosinase of I. tectorum root,fruit and leaf were measured.The result showed that all of the I. tectorum fruit,root and leaf had obviously antioxidant capacity.However,the antioxidant capacity of different parts of I. tectorum was different.DPPH radical scavenging capacity in the order:fruit > leaf > root;hydroxyl radical scavenging capacity in the order:fruit > leaf > root;and T-AOC in the order:fruit > root > leaf.The tyrosinase inhibition capacity of I. tectorum root and leaf was slightly stronger than that of I. tectorum fruit,but all the three parts of I. tectorum did not show strong tyrosinase inhibition activity.The inhibition rate of tyrosinase in the order:root > leaf > fruit.

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