Abstract: With the gas geological theory and method and base on the development law and formation mechanism of the Guodishan faults, combined with the thickness of seam, secondary structure and the distribution of tectonic coal characteristics, _J16-17 seam in Guodishan fault zone was divided into two geological units. The base on the gas content of J_16-17 seam exploration and the measured gas content data in fault zone, the gas distribution features of the units were analyzed. The same standard under the fault footwall coal seam gas content is high. Conclusion is obtained that the major influencing factors are geological structure, burial depth and the distribution of tectonic coal. The methane content generally rises with increasing coal depth, but due to fault activities, gas content distribution has some differences.