Tyrosinase is a key enzyme that catalyzes melanin synthesis in the organism.The activity and inhibition mechanism of ethyl acetate phase from glycyrrhiza glabra extracts on tyrosinase was studied in this paper.The active ingredients in glycyrrhiza glabra were extracted by ethanol solution.Tyrosinase activity was estimated by measuring the oxidation rate of L-dopa.Then Lineweaver-Burk curve was made,on which the inhibiting types of licorice extracts was deduced.The results show that licorice extracts could i...