This paper studied the micro-pore structures of the shale reservoir by using Argon-ion polishing,Scanning Electron Microscope(SEM),high-pressure mercury injection and low temperature nitrogen adsorption and desorption technology.The shale gas reservoir consist of organic pore,clastic pore,clay pore and micro-fracture.Based on conventional logs and the micro-resistivity image logging,an evaluation method of micro-pore porosity is proposed by identification each micro-pore type of shale gas reservoir.Contrasted the micro-pore porosity then with the core analysis,verify the accuracy and reliability of the above methods.