Shale gas is unconventional resource. Its characteristics of source rock and reservoir rock are different from that of conventional natural gas reservoirs. Thus, the shale gas resource calculation method should be different from that of conventional gas reservoir. Firstly, the shale gas resource evaluation method suitable to China is proposed according to the geological conditions of shale gas development in China as well as the availability of data. It mainly includes volumetric method which is suitable for the high degree exploration area and analogy method which is suitable for the low degree exploration area to calculate the amount of resources.Key parameters of the volumetric method which including the effective thickness, gas content, gas saturation and porosity, are pointed out, and the method for determining these parameters is described. Standards of analog parameter values are proposed and seven indicators including organic carbon content, kerogen type, maturity, shale monolayer thickness, brittleness index, porosity, burial depth are considered as the main parameters of the shale gas geological analogy. The volumetric method and analogy method both have advantages and disadvantages, thus, the total shale gas geological resources should be calculated taking account of the actual situation of evaluation area, and appropriate resources evaluation method should be selected.