A physiological detection system including an array sensor and a processing unit is provided. The array sensor is configured to output array PPG signals. The processing unit is configured to construct a 3D energy distribution according to the array PPG signals to accordingly identify different microcirculation phases.一種生理偵測系統,包含一陣列式感測器以及一處理單元。該陣列式感測器可用以輸出一陣列式變化信號,該處理單元用以根據該陣列式變化信號建立一三維能量分佈並具以判斷不同微循環狀態。