Coalbed methane (CBM) occurring in almost all coal beds can be released through fracturing, which will not only provide a clean energy resources but enhance production safety in coal mining. The features of CBM determine adoption of experiment method and the particularity of final conclusion. This paper focuses on experimental evaluation of longterm conductivity of fracturing in coal beds. The results show that different from sandstone strata, coal beds are of low hardness and easily broken, and embedment of various fragments in fractures is very common. Fragmentation and adsorption of proppant in coal beds, along with other factors, result in decrease of conductivity of fractures. Because closure pressure of coal beds is an important parameter, the experiment contrastively analyzed the factors such as sand concentration, type, diameter and combination of proppant, fragmentation and embedment of proppant particles, and residue, and their effects on conductivity of fracturing under the condition of various closure pressures. It is concluded in this study that embedment does great harm to conductivity of fractures. Although increase of sand concentration and adoption of lowering proppant and closure pressure will to some extent improve conductivity of fractures in coal beds, their effects decrease with increasing of closure pressures. Therefore, this study is of some practical significance in gas exploitation and engineering design and construction.