The embodiments of the present disclosure disclose a method and apparatus for establishing a blood pressure model. The method comprises: acquiring pulse wave data, electrocardiographic data, blood pressure data and body mass indexes of a plurality of subjects to be examined; determining pulse wave transit time and pulse wave intensity ratios based on the pulse wave data and the electrocardiographic data; establishing a blood pressure model based on the blood pressure data, the pulse wave transit time, the pulse wave intensity ratios, and/or the body mass index.