A cardiac pacemaker and a regulating method thereof are disclosed. The cardiac pacemaker includes a control unit, a sensing unit and an analyzing circuit. The control unit is configured for outputting a pacing control signal in accordance with a hearth rate of a heart. The sensing unit is configured for capturing a blood pulse signal. While the pacing control signal has a first constant pacing, the analyzing unit is configured for analyzing amplitude and reflection time of the blood pulse signal, and outputting a regulation parameter according to the amplitude and reflection time of the blood pulse signal. The control unit is configured for regulating the pacing control signal from the first constant pacing to a different second constant pacing according to the regulation parameter.一種心律調節裝置及其調節方法。心律調節裝置包含控制單元、感測單元以及分析單元。控制單元用以輸出心律控制訊號對應心臟的跳動頻率。感測單元用以擷取血液脈波訊號。當心律控制訊號具有第一固定節律時,分析單元分析血液脈波訊號的振幅以及血液脈波訊號的反彈波時間,並據以輸出調節參數,控制單元用以根據調節參數將心律控制訊號由第一固定節律調整至相異的第二固定節律。300‧‧‧心律調節裝置310‧‧‧感測單元320‧‧‧分析單元330‧‧‧控制單元Vpul‧‧‧血液脈波訊號Vpar‧‧‧調節參數Vcon‧‧‧心律控制訊號
