A blood pressure detection method includes the steps of: acquiring a PPG signal from a skin surface using a light sensing element calculating a blood pressure corresponding to each pulse duration according to at least one pressure estimation model and a time difference between two feature points within one pulse duration calculating a breathing period averaging a plurality of blood pressures within the breathing period to generate an average blood pressure and showing the average blood pressure with a display device.一種血壓偵測方法,包含下列步驟:利用一光感測元件從一皮膚表面取得一光體積變化訊號;根據至少一血壓推估模型及該光體積變化訊號之一脈搏期間中兩特徵點間之一時間差相對每一該脈搏期間計算一血壓值;計算一呼吸週期;平均該呼吸週期內之複數血壓值以產生一平均血壓值;以及以一顯示裝置顯示該平均血壓值。21‧‧‧收縮壓訊號22‧‧‧舒張壓訊號Pb‧‧‧呼吸週期
