The invention provides an ultrasonic-based liver fat quantification method and system. According to recommendations, the system comprises an ultrasonic transmitter, an ultrasonic receiver, an ultrasonic signal processing module, a liver near-field positioning module, a liver far-field positioning module and an ultrasonic attenuation coefficient calculating module the ultrasonic transmitter is used for transmitting pulse ultrasonic to liver tissues the ultrasonic receiver is used for receiving ultrasonic echo signals of the liver tissues the ultrasonic signal processing module is used for compensating, sampling, demodulating, envelope detecting or filtering of the ultrasonic echo signals of the liver tissues, so as to obtain processed ultrasonic echo corrected signals the liver near-field positioning module is used for positioning a near-field region RN of a liver the liver far-field positioning module is used for positioning a far-region of the liver the ultrasonic attenuation coefficient calculating module is used for calculating an ultrasonic attenuation coefficient Epsilon of the liver.
