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Absolute humidity is an important control parameter for high-flow respiratory humidifiers. Improper control can affect the therapeutic effect. Established an accurate steady-state model is the basis for controlling absolute humidity. Through the research on the system structure and working principle of the humidifier, the mechanism model of the steady state process of the humidifier was established. This model had multiple dimensions, high order and nonlinearity and lacked some measurable parameters, made it difficult to accurately identify the model. A multi-linear linear fitting method was used to establish a steady-state model with the outlet temperature of the humidification tank as the control target. The instrument test results show that the absolute humidity of the outlet of the humidification tank is indirectly controlled by the temperature of the outlet of the humidification tank. Control, verify the validity and practicability of the data model.