Abstract: The MgO brick regenerator structure commonly used in engineering is taken as the research object,through the non-fixed value characteristics of thermophysical parameters,the related parameter curves are fitted,and the fixed value and non-fixed value of thermophysical parameters are compared and analyzed. The non-fixed value analysis method is verified by experimental means. Various heat storage power of regenerator is analyzed by non-fixed value analysis method,and the change trend of corresponding heat storage time and heat storage capacity is obtained. From the whole and local point of view of the regenerator,the temperature distribution at different positions of the regenerator is analyzed. The results show that fixed-value analysis and non-fixed-value analysis are quite different,and the reliability of non-fixed-value analysis method is verified by experimental methods. The overall temperature distribution of regenerator decreases from the center to the periphery,and the temperature between heat sources in local analysis is concave parabolic distribution. The heat storage capacity decreases with the increase of heat storage power. When the heat storage capacity reaches 80% of the theoretical heat storage capacity under this structure,the heat storage power needs to be less than 110 kW.