The six fundamental conditions of the coal reservoir and its caprock assemblages with some regular occurrence in spacetime exist in China. The sealing capability of the shallow sea and barrier island system to coal reservoir is relatively high, that of the shallow sea and plane coast system becomes mostly poor, that of the littoral delta system is commonly good, that of the fluvial system is relatively good if the sedimentary unit is complete or very poor if the coal reservoir is directly overlaid by the channel or splay medium to coarsegrained sandstone, that of the lake system is sufficiently high, and that of the alluvial fan system is generally very poor. The relationship between the sedimentation and coalbedroof condition not only occurs regionally in the North and South China, but also controls the distribution of the coalbed methane content in some given coalfields or coal mining districts, which provide the important reference for the prediction of the gasbearing coalbeds.