Rab proteins are one member of the Ras superfamily of small GTP-binding proteins.Phylogenetic analysis of amino acid sequence of Rab proteins indicate there are eight subfamilies in plants,such as RabA,RabB,RabC,RabD,RabE,RabF,RabG and RabH.The different Rab proteins are generally localized to the cytosolic face of specific intracellular membranes,where they act as key regulators of vesicular trafficking pathways.Rab proteins have highly conserved structural domains and greatly functional diversity.They have very important roles in cell proliferation,apical dominance,pollen tube growth,nodule development,and in response to both biotic and abiotic stresses.Therefore,this paper mainly summarized the structure characteristics and the function of Rab proteins in plants.