The present invention relates to a biofeedback system, which may provide the breath guiding signal and autonomic nervous activity information as the basis of self-adjusting autonomic nerve function for a user in an autonomic nerve training session and may further complete a biofeedback loop. The system comprises a wearing type physiological sensor having at least one physiological sensing element disposed on the users body to acquire the physiological signal related to the physiological activities affected by the autonomic nervous system, and a sensible signal generating source for generating a sensible signal including first information and second information, wherein the sensible signal may represent the breath guiding signal by the first information and the information related to the autonomic nervous activities of the user via the second information, such that the user may conduct a breath behavior pattern based on the first information and may proceed a self-consciousness control based on the second information for achieving the influence to the autonomic nervous activities.本發明關於一種生理回饋系統,用以提供呼吸導引訊號及自律神經活動資訊,以作為使用者在一自律神經訓練區段中自我調整自律神經功能的基礎,進而達成一生理回饋迴路,該系統包括一穿戴式生理感測裝置,具有至少一生理感測元件,設置於該使用者身上,以取得相關於受自律神經系統影響之生理活動的生理訊號以及一可感知訊號產生源,用以產生包括一第一資訊以及一第二資訊的一可感知訊號,其中,該可感知訊號透過該第一資訊表現該呼吸導引訊號,以及透過該第二資訊表現該相關使用者自律神經活動的資訊,以讓使用者可根據該第一資訊而進行一呼吸行為模式,以及根據該第二資訊而進行一自我意識調控,進而達成對自律神經活動的影響。