In this paper, systematic classification was conducted for the fissure systems of China's coal

seams, and the main causes for the different types of fissures were described. Based on 2D, 2C

anisotropic elastic waveequation staggering grid highorder finitedifference numerical

simulation, the authors carried out the numerical simulation of elastic wave field for the isotropy model

and the water-saturated and dry media 2D layered model with fracturebearing coal seams of high

fracturing density. The results show that, in comparison with the fracturesfree coalseam, the

fracturesbearing coalseam has the following characteristics: the surge impedance of the boundary

plane at the top and the bottom is changed due to the change of wave velocity, causing the change of

dynamic characteristics of the wave. The AVO phenomenon is especially obvious. The characteristics of

x component and z omponent are opposite in dry fractural media and in watersaturated

fractural media, and the velocity of wave is faster in watersaturated fractural media than in dry

fractural media. It is thus thought that coalseam fractures are detectable by using anisotropy theory.