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Calculate the arterial oxygen saturation (SaO2) of the tissue by detecting the ratio of changes in the absorbance of red light and infrared light of different wavelengths (R/IR value) of hyperemia peripheral tissues such as fingers or earlobes, etc., according to Beer-Lambert law , The functional relationship between the ratio R/IR and the arterial oxygen saturation (SaO2) should be linear, but because biological tissue is a complex optical system with strong scattering, weak absorption, and anisotropy [2~4], it is not completely It conforms to the classic Beer-Lambert law, which makes it difficult to establish a mathematical model that expresses the relative changes in the absorbance of red light and infrared light (R/IR value) and the relationship between the arterial blood oxygen saturation (SaO2). The corresponding relationship between R/IR and SaO2 can only be determined by experimental methods, that is, the calibration curve.