China’s shale gas exploration and research is still in the primary stage, and facing many complicated geological and engineering problems. Although it has obtained a large number of precious experiences through the analogy of matured shale gas in the United States, it has its unique characteristics. Therefore, it is necessary to establish a set of effective resources evaluation system.Based on the exploration target of shale gas, this paper provides some questions about the different reservoir characteristics at home and abroad, such as the“formation water”storage and percolation mechanism in shale reservoir, the relationship between fracturing effect and genetic types of natural gas, then suggesting the shale reservoir classification evaluation in different depositional system so as to look for the shale gas“dessert”, and realize the reasonable and maintainable development of shale gas in China.