The studies carried on during the last three decades with respect to bamboo have been directed to the physical, mechanic and microstructural characterization of different species, under static load. The experience has shown that the houses and buildings constructed using bamboo as structural element have had good resistance to earthquakes. This work is one of the first researches to know the bamboo dynamic behaviour. It was studied the dynamic properties of systems made of bamboo with the species Dendrocalamus Giganteus and Phyllostachys Áurea. The researched dynamic properties correspond to values of damping and natural frequencies of vibration for each specie, which were gotten through free vibration and modal tests. With the intention to study the influence of the storage period in the dynamic response of the material, for culms of Phyllostachys Áurea specie, five variables were considered: culms without treatment cut in March of 2008, without treatment cut in May of 2007, without treatment cut in 2001, with treatment on fire (blowpipe) cut in March of 2008 and with treatment on fire (blowpipe) cut in May of 2007. Furthermore, for the two species was determinate the variation of damping in function of variation of the quantity of fibers along the material thickness.