Abstract: A new type of solar energy storage system（double-truncated cone type）has been proposed in this paper. Then the mathematical model has been verified. Finally,the heat transfer characteristics of the solar energy storage system under various variable parameters have been calculated. The results show that increasing the inlet temperature and flow rate of heat transfer medium can increase the heat storage rate of the regenerator. Comparing with the outlet temperature of the single-truncated cone type heat storage tank,the heat utilization ratio of the double-truncated cone type heat storage tank is significantly improved. The results also show that in the range of the numerical calculation parameters in this paper,when the inlet temperature and flow velocity of the heat transfer medium are 747 K and 1.2 m/s respectively,the heat storage effect of the double-truncated cone is the best. The research results can provide a reference to know the high-efficient solar energy utilization.