Abstract: To effectively study the characteristics of coal pore and fissures,the pore and fissures of coal were character- ized by qualitative and quantitative characterization and analysis. The coal sample of 311102 working face in Bayan- gaole Colliery of Inner Mongolia was studied. Based on the IEISS Xradia 510 X-ray microscope Get the CT data. The mathematical algorithm was embedded in the three-dimensional visualization software AVIZO. The study proposed the methods of quantitative characterization of pore and fissure and set up a three-dimensional model of pore and fissure of coal and a pore network model with topology structure. The coal sample microscopic parameter of pore and fissures in- cludes pore size,pore volume,porosity,coordination number and length of throat. The results show that under the mi- cron scale the coal samples of Bayangaole Colliery are mainly in macroporous and have a cleat network. Its effective porosity is 10. 34% . The number of pores is 12 834,and the number of throats is 432. These are calculated by the pore network model.