Abstract: This paper described relationships of the dynamic sheer modulus and density,microfibre angle of bamboo.The dynamic sheer modulus,density and microfibre angle of two kinds of bamboo in radial and axial direction were measured by means of torsion pendulum,electronic densimentry and X ray diffraction respective.The result showed that the dynamic elastic modulus and dynamic loss modulus increased with increase in density and microfibre angle,whereas the loss tangent decreased.It is concluded that dynamic sheer modulus of bamboo were much dependent on density and microfibre.