Disclosed herein is a skin detection method, which is executed by a skin detection device and includes: (A) measuring a skin impedance after a preset time value and generating a skin impedance signal indicating the current impedance value (B) based on the current impedance value and the preset time value to obtain an impedance gain, the impedance gain is positively correlated with the current impedance value, and negatively correlated with the preset time value (C) according to the impedance gain and a time function that exponentially varies with a time parameter to produce an impedance function, the impedance function specifies a positive correlation relationship between a plurality of impedance values and a plurality of time values and (D) based on the critical impedance value and the impedance function to calculate a time value corresponding to the critical impedance value for use as a critical time value.一種肌膚檢測方法由一肌膚檢測裝置執行,且包含:(A)在一預設時間值後量測一肌膚的阻抗且產生一指示一目前阻抗值的阻抗量測信號;(B)根據該目前阻抗值及該預設時間值來得到一阻抗增益,該阻抗增益與該目前阻抗值為正相關,且與該預設時間值為負相關;(C)根據該阻抗增益及一追隨一時間參數呈指數變化的時間函數來產生一阻抗函數,該阻抗函數規範多個阻抗值與多個時間值的正相關對應關係;及(D)根據該臨界阻抗值與該阻抗函數以得到該臨界阻抗值對應的該時間值以作為一臨界時間值。A‧‧‧量測步驟B‧‧‧產生阻抗增益步驟C‧‧‧產生阻抗函數步驟D‧‧‧運算臨界時間值步驟E‧‧‧運算保濕持續時間步驟F‧‧‧顯示及/或傳送步驟
