A method of detecting eye Fatigue includes steps as follows. An image capturing component of a head-mounted display captures a human eye image. According to the human eye image, determining whether a human eye change feature reflects a fatigue state； when the human eye change feature reflects the fatigue state, a display parameter of a display of the head-mounted display is decreased.一種偵測眼睛疲勞的方法包，含以下步驟：透過頭戴式顯示器的影像擷取元件以擷取人眼影像；根據人眼影像判斷人眼變化特徵是否反映一疲勞狀態；當人眼變化特徵反映疲勞狀態時，將頭戴式顯示器的顯示器的顯示參數降低。
