The dynamic viscoelasticity of the outer and inner part of bamboo with different ages was investigated using Dynamic Mechanical Thermal Analyzer (DMA). The results showed that, storage modulus (E’) and loss modulus (E ”) of both outer and inner part of bamboo were increased at temperature between 25-250 degrees C as the bamboo ages increasing. In addition, E’ and E ” of the outer part of bamboo were higher of the inner part with the same bamboo age. Also a significant loss peak in E ”similar to T curves between 190-210 degrees C. was found. The peak values of E ”similar to T curves of the outer part only shown slight variation with bamboo age increasing. However, significantly different of peak values was found in the inner part. This was caused by the difference of the chemical composition in outer and inner part of bamboo with different ages. The width of E ” peak varied slightly in outer bamboo of different ages, but in the inner part, it was increased as the age increasing. This revealed that in the outer part of different ages, the chemical composition of the molecular values was closer, In the inner bamboo, it was increased as the age increasing..