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In this paper, an approach to the optimum volume of rock bed, its charged thermal energy and the optimum air flow rate for an air-based solar heating system in charging mode is presented. The relationship between the optimum volume of rock bed and the air flow rate is approximately obtained as a theoretical solution of the linear approximation equation, and the charged thermal energy in the rock bed is approximately obtained as a function of the air flow rate. And it is found that a sort of the optimum air flow rate is obtained as the air flow rate in which effective charged heat is at maximum value.