This paper deals with the phenology of fourteen main tree species in montane humid evergreen broad leaved forest in Ailao Mountains. The main phenological characters of these trees were observed, the phenological spectrum was described and the relationship between the phenological rhythms of the tree species and the environmental factors of light, temperature ect. was investigated. Through the principal component analysis(PCA), it has been discovered that the main meteorological factors, which are most closely related to the phenological performance of these trees, are the mean temperature and ≥5℃ accumulated temperature of different phenological period. The light duration and temperature play an equally important role in the induction of flowering,and in the leafing period, the precipitation and light play a leading role.