Abstract: The tortuosity factors of the silver catalyst for ethylene oxide formation with hollow cylindrical shape were measured by classical steady state and dynamic state method (SPSRM).The experimental results of the two methods were almost the same.A new calculation method and an on- line analysis technique with computer were used in SPSRM.These improvements can make the SPSRM experiments more convenient,simple and reliable.A new method for measuring effective thermal conductivity of solid catalyst was developed.The method is simple,convenient and accurate and can be used to plate,cylinder and other shape solid catalysts without changing the shape and physical structure at any reaction temperature.The effective thermal conductivities of ethylene oxide synthesis catalyst with hollow cylindrical shape were measured with this method.Experimental results were used to calculate the distribution of components,temperature and selectivity within the silver catalyst.The calculation results agreed well with experimental data of global kinetics.