Abstract:Three sets of physical models are built based on Hudson theory with different fracture density,aperture and length.Test amplitudes of P-wave on the models are recorded by the pulse transmission method.Experimental data are compared with theoretical data from Hudson theory and quality factor Q of models are obtained using classic spectral ratio method for determining attenuation.The study results show:①With the increase of fracture density,amplitude has a little decrease and azimuthal amplitude anisotropy.By the analysis of comparing results,it can be seen that Hudson theory's prediction is exact.②With the increase of fracture length,amplitude increases in the mass and the situation is similar in X and Z directions.But the prediction of Hudson theory is different with small decrease.③With the increase of fracture opevture,the variation of amplitude is much bigger than the prediction,which means that the theory underestimate the effect of fracture length.④The anisotropy of velocity and amplitude changes similarly with different fracture parameters.The influence of fracture aperture is most obvious and attenuation anisotropy is more sensitive to the change of fracture parameter than velocity anisotropy.