By using the experimental data of scanning electron microscopy(SEM), nuclear magnetic resonance, nitrogen adsorption, X?鄄ray diffraction, Ro, TOC and maceral composition, the pore structure characteristics of Lower Silurian Longmaxi Formation shale in Fenggang area, northern Guizhou were discussed. The results show that the organic carbon content of shale in the study area is quite different, with vitrinite reflectance of 1.363%￣2.647% and high content of clay minerals; the common organic pore and micro?鄄crack in the shale have the mainly round, long slit and ink bottle shapes, with the porosity of shale ranging from 6.53% to 8.33%; the shale pore is mainly mesoporous, with pore diameter of 2￣50 nm, larger BET specific surface area of pore and the average total volume of 0.01962 cm3/g; the development of pore is influenced by maturity of organic matter, organic matter content and minerals content. With the increase of clay minerals and TOC, the pore volume and specific surface area of shale show an increasing trend; but when Ro and brittle minerals such as quartz increase, the porosity and total pore volume decrease.
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