Abstract: Statistical analysis shows that there are obvious differences between the primary structure coal and the fractured coal in the mechanical parameters of the crack index and Schlumberger ratio. Fracture index of primary structure coal is generally greater than 0.23, less than 0.33, concentrated in the distribution of 0.29, while the fracture index of fractured coal is generally larger than 0.31, less than 0.41, concentrated in the distribution of 0.35. The Schlumberger ratio of the fractured structure coal is generally greater than 0.05, less than 0.15, concentrated in 0.11, while the Schlumberger ratio of the primary coal is greater than 0.13, less than 0.24, concentrated in 0.19. And the corresponding standard of coal structure is formed. The accuracy rate reached 84% by using the crack index and Schlumberger ratio to identify the media structure.