A wrist-worn electronic device configured to measure blood pressure, comprising a main body and a wrist strap connected to the main body , wherein the wrist strap is configured to wear the main body on a wrist of a target user, and the wrist-worn electronic device further comprises: a wrist size determining module , configured to measure, by using the wrist strap of the wrist-worn electronic device , a use circumference of the wrist-worn electronic device that matches a wrist size of the target user, and determine the wrist size of the target user based on the use circumference of the wrist-worn electronic device ; and a blood pressure determining module , configured to detect a pulse wave signal of the target user, measure a blood pressure of the target user based on the pulse wave signal, and correct the blood pressure of the target user based on the wrist size of the target user, to obtain first corrected blood pressure of the target user, characterised in that the wrist-worn electronic device further comprises a pressure sensor disposed on an inner circumferential surface of the wrist-worn electronic device , and the pressure sensor is configured to measure pressure between the wrist-worn electronic device and the wrist of the target user when the wrist-worn electronic device is worn on the wrist of the target user; the wrist size determining module is configured to determine said wrist size of the target user based on the use circumference of the wrist-worn electronic device and the pressure measured by the pressure sensor ; and the blood pressure determining module is configured to correct the measured blood pressure of the target user based on the pressure measured by the pressure sensor and said wrist size of the target user, to obtain second corrected blood pressure of the target user. a wrist size determining module , configured to measure, by using the wrist strap of the wrist-worn electronic device , a use circumference of the wrist-worn electronic device that matches a wrist size of the target user, and determine the wrist size of the target user based on the use circumference of the wrist-worn electronic device ; and a blood pressure determining module , configured to detect a pulse wave signal of the target user, measure a blood pressure of the target user based on the pulse wave signal, and correct the blood pressure of the target user based on the wrist size of the target user, to obtain first corrected blood pressure of the target user, characterised in that the wrist-worn electronic device further comprises a pressure sensor disposed on an inner circumferential surface of the wrist-worn electronic device , and the pressure sensor is configured to measure pressure between the wrist-worn electronic device and the wrist of the target user when the wrist-worn electronic device is worn on the wrist of the target user; the wrist size determining module is configured to determine said wrist size of the target user based on the use circumference of the wrist-worn electronic device and the pressure measured by the pressure sensor ; and the blood pressure determining module is configured to correct the measured blood pressure of the target user based on the pressure measured by the pressure sensor and said wrist size of the target user, to obtain second corrected blood pressure of the target user. <EOS>