The limonoids are secondary metabolites in the group of triterpenoids and exist in the Citrus and Meliaceae.As early as people exploring the reasons for bitterness of citrus juices,limonoids are discovered and researched.The variety biological activities of limonoids,such as anti-tumor,anti-malarial,anti-oxidation,are important to human health.This article reviews biological activities of limonoids currently found and...