Abstract: In order to study the reservoir characteristics of tectonic coal, Changcun Coal Mine in Shanxi Lu’an Group was taken as the research background. For 4 kinds of tectonic coal with different destructive types, the mercury intrusion method was used to measure the microscopic pore structure characteristics, and its influencing factors were also analyzed. The research results show that pore structure varies a lot among tectonic coal with different deformation degrees. The specific surface areas of micro-pores and transition pore ranges are from 2.473 4 m²/g to 4.254 2 m²/g and from 0.893 2 m²/g to 1.708 9 m²/g, respectively. The macro-pores and mesopores in coal decrease to a large extent under the effect of tectonic deformation. With the increase of coal burial depth and deformation degree, the average coal pore diameter and porosity display a first rapid and then slow nonlinear variation, and the pore diameter continuously declines. Consequently, the proportion of micro-pores continues to increase.