Abstract: Suppose that source region is ATI medium and propagation path is isotropic media, analytical representations of far-field P-wave displacement and radiation are given and we discuss the effects of source anisotropy on far-field P-wave displacement and focal sphere. Some results show that crack density, azimuth et al. parameters play an important role in P-wave radiation and lead to non-double-earthquake mechanism. We propose that It maybe a good method which we can directly detect percentage of DC, CLVD and ISO for micro-earthquake before large earthquake in the well.