The present invention provides methods, systems and equipment for acquiring and extracting information by utilizing biological features. The method for acquiring information by utilizing biological features comprises: a terminal acquires first data; the terminal controls a light source to generate an intensity-variable optical signal according to the first data, and projects the intensity-variable optical signal onto an iris; and the terminal acquires first iris information, the first iris information at least comprising first iris contraction information, the first iris contraction information being generated according to the intensity-variable optical signal, and the first iris contraction information comprising first iris contraction activity.
