The dynamic viscoelastic properties of bamboo were tested by dynamic mechanics analyzer (DMA), and the measurements were done in the temperature range of 40 ℃ to 300 ℃ at frequencies of 3 Hz. The results showed that: with the increase of irradiation dose, the decrease of storage modulus with increasing temperature became more dramatically. The decrease extent of storage modulus was the lowest for non-irradiated bamboo Two mechanical relaxation processes were observed for all kinds of irradiated bamboo. The α relaxation process in lower temperature range was due to glass transition of hemicellulose and login, while the β relaxation process occurred in higher temperature range was based on glass transition of cellulose. The loss peak strength of α relaxation process went up as the irradiation dose increase,while the loss peak strength of β relaxation process became go up first and then down,which was caused by the chemical reaction of the chief composition of bamboo.
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