Abstract: Plant hormones play important roles in regulating plant growth and development. Because hormone responses are usually concentration-dependent, endogenous hormone levels must be tightly controlled. Glycosylation may be one of the important modifications modulating active hormone levels. With the cloning and identification of glycosyltransferases genes involved in glycosylation of plant hormones, the mechanism and roles of glycosylation of different plant hormones were gradually revealed. This review focuses on recent research progress in understanding enzyme activities and biological functions of glycosyltransferases for auxins, cytokinins, abscisic acids, brassinosteroids, salicylic acid and jasmonic acid. We discuss remaining questions to be answered and prospects for hormone glycosylation study.