Contents of endogenous hormones in Litchi fruits (Litchi chinensis Sonn.Var.Hualzhi) were determined during fruit development The data showed that the contents of the cytokinind (CTK) and Indole-3-acetic acid (IAA) were higher during the early stages of fruit development.There were a peak of gibberellin4+7 rlevel and a peak of ethylene level at the second stage of fruit development.The fluctuations of these endogenous hormone levels were correlated respectively with growth ,development and drop of fruits.Treated fruiting panicles with CTK at the first stage or GA3 at the secod stage could increase the rate of fruit setting obviously.