A method for identifying user identity by using blood pressure signal, comprises steps of: detecting a blood pressure signal in process of a blood pressure cuff deflating to form a curve with direct-current level and a plurality of waveforms with alternating current level, each of the waveforms corresponding to a pressure value in the curve when the blood pressure cuff deflating to reach a specific pressure in the curve at intervals of a specific pressure drop, selecting one waveform corresponding to the specific pressure from said waveforms calculating a first area of a rising band of the selected waveform and a second area of a drop band of the selected waveform to defining a plurality of blood pressure characteristic values inputting the blood pressure characteristic values into an identification algorithm of user identity, and outputting a recognition result. Using the aforementioned method makes the use of a blood pressure measurement device more convenient, without doing login before measuring blood pressure every time, so as to store the user data automatically.一種利用血壓訊號辨識身份的方法,其步驟包括:在壓脈帶洩氣過程中偵測血壓訊號,形成一直流曲線及複數交流波形,其中每一交流波形對應於直流曲線中的一壓力值;當壓脈帶每下降一特定壓力差而使直流曲線達到一特定壓力值,即選出一對應於此特定壓力值的交流波形;對於被選擇的交流波形,分別計算其上升波段的面積及其下降波段的面積,以定義複數血壓特徵值;將這些血壓特徵值輸入一身份辨識演算法,而輸出一辨識結果。使用前述方法讓血壓量測裝置的使用更方便,不需在每次量測血壓前做登入動作,即可自動儲存使用者的資料。DC‧‧‧直流準位訊號AC‧‧‧交流訊號W1,W2,W3‧‧‧交流波形t1,t2,t3‧‧‧時間點P1,P2,P3‧‧‧壓力值△P‧‧‧特定壓力差1‧‧‧最大振幅X,Y‧‧‧振幅
