The phenology of 22 woody species of the Luki Biosphere Reserve in the Kongo central Province, Democratic Republic of Congo was analyzed. Direct and indirect observations were made on trees every ten days from July 2009 to July 2010 taking into account the phenological phases which are flowering, fruiting, dissemination and defoliation. The species studied are divided into three groups (evergreen species, semi-deciduous species and deciduous species). A peculiarity was noted for the spread of Xylopia welwicthii trees that was difficult to determine as ripe fruit and burst several times before falling to the ground. The fact that the problem does not arise in the determination of the period corresponds better to the dissemination of the fruits of this species. For all four families under study, the different phenological stages are under the control of climate variations. For the different families studied, observe a strong dispersion of phenological events over the months of the year. These results suggest a high interspecific and intraspecific variability in the occurrence of phenological events observed in this study, namely flowering, fruiting, dissemination and defoliation.