A method for predicting sudden drop in blood pressure is provided. The method includes following steps: receiving a first physiological information corresponding to a first user； receiving a first current blood pressure of the first user； obtaining a sudden drop probability according to a blood feature model, the first physiological information and the first current blood pressure； determining whether the first current blood pressure is not less than a trigger threshold value； and determining a sudden drop in blood pressure will occur in response to the first current blood pressure is not less than a trigger threshold value.本揭露提供一種預估血壓驟降的方法，並具有下列步驟：接收相應第一使用者的第一生理資訊；接收第一使用者的第一當前血壓；依據血壓特徵模型、第一生理資訊以及第一當前血壓獲取降壓事件機率値；判斷降壓事件機率値是否不小於觸發門檻值；以及在判斷降壓事件機率値不小於觸發門檻值時，判斷血壓驟降事件會發生。
