Drawing on relevant theories, a quantitative study on model and basic concepts for thermodynamic system has been conducted. It Includes following concepts: thermodynamic system (system interior, system border and system outside), the border (border wall and border gate), the open degree (not only the function of space and time, but also related to energy, quality and information), the exchange rate (including quality, energy and information exchange rate; and it is a composite function, correlated to the opening degree of border, the state inside the system, time and space and so on). Accordingly, the relationship between the opening degree and the exchange rate of system has been analyzed, and the system stability (opening degree) criterion is derived.

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