Abstract: The rapid pyrolysis experiments of Shenfu coal with various moisture content prepared by adding water were conducted in a high-frequency furnace to study the influence of moisture content on the thermal behavior. The gas composition and the structure properties of char were analyzed. The result shows that the gas yield and the maximal release rate decrease when the moisture content of coal increases. After pyrolysis, both BET surface and pore volume increase with increasing moisture. Compared to the char from dry coal pyrolysis, the char from pyrolysis of coal with high moisture content has more developed pore structure with more micropores. Furthermore, the moisture can inhabit the occurrence of pore obstruction and collapse during rapid pyrolysis, and also contribute to the enhancement of the surface roughness and the pore structure complexity.