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Lianas is one of conspicuous plant in tropical rainforests. Its special characteristics is climbing or twisting around other plant. Gunung Tilu nature reserve is one of remaining tropical forest in West Java which potentially as lianas habitat. This research aims are inventory and determine the diversity of lianas in Gambung area which is the most potential area for lianas habitat in Gunung Tilu nature reserve. This research was carried out by descriptive exploratory method. Sampling was done by combining transect and quadrat technique method, with length of the transect is 700m which stretched from an altitude of 1489mpl (the lowest altitude at the study site) to 1580mdpl (highest altitude). The results showed that there were 13 families, 15 genera with 24 species of lianas. Tetrastigma sp. is the type of liana with the highest Important Value Index of 29.24%, while Aescyhnanthus sp.2 and Cissampelos pareira have the lowest Important Value Index of 0.47%. Lianas Shannon – Wiener diversity index in Gambung area Gunung Tilu nature reserve is 1.092.