A method for determining an ambient light intensity, applied to a terminal comprising a display screen and a photosensitive element, and the method comprising: acquiring by the photosensitive element a plurality of light sensing integral values obtained by sampling a light intensity with a predetermined light sensing collecting time window and a predetermined sampling frequency, wherein the light sensing collecting time window is greater than a screen blanking time of the terminal; determining a minimum light sensing integral value and a maximum light sensing integral value in the plurality of light sensing integral values; determining a light sensing integral value of the photosensitive element which corresponds to an ambient light according to the maximum light sensing integral value, the light sensing collecting time window, the minimum light sensing integral value and the screen blanking time; and determining the ambient light intensity according to the light sensing integral value of photosensitive element which corresponds to the ambient light and a predetermined light intensity, characterized in that: the determining a light sensing integral value of the photosensitive element which corresponds to an ambient light according to the maximum light sensing integral value, the light sensing collecting time window, the minimum light sensing integral value and the screen blanking time comprises: determining an integral density of the ambient light per unit time according to the maximum light sensing integral value, the light sensing collecting time window, the minimum light sensing integral value and the screen blanking time; and determining a product of the integral density of the ambient light per unit time and the light sensing collecting time window as the light sensing integral value of the photosensitive element which corresponds to the ambient light, wherein the minimum light sensing integral value corresponds to a sample collected in a time window including an entire screen blanking time; and the maximum light sensing integral value corresponds to a sample collected in a time window comprised within an entire bright screen time. acquiring by the photosensitive element a plurality of light sensing integral values obtained by sampling a light intensity with a predetermined light sensing collecting time window and a predetermined sampling frequency, wherein the light sensing collecting time window is greater than a screen blanking time of the terminal; determining a minimum light sensing integral value and a maximum light sensing integral value in the plurality of light sensing integral values; determining a light sensing integral value of the photosensitive element which corresponds to an ambient light according to the maximum light sensing integral value, the light sensing collecting time window, the minimum light sensing integral value and the screen blanking time; and determining the ambient light intensity according to the light sensing integral value of photosensitive element which corresponds to the ambient light and a predetermined light intensity, characterized in that: the determining a light sensing integral value of the photosensitive element which corresponds to an ambient light according to the maximum light sensing integral value, the light sensing collecting time window, the minimum light sensing integral value and the screen blanking time comprises: determining an integral density of the ambient light per unit time according to the maximum light sensing integral value, the light sensing collecting time window, the minimum light sensing integral value and the screen blanking time; and determining a product of the integral density of the ambient light per unit time and the light sensing collecting time window as the light sensing integral value of the photosensitive element which corresponds to the ambient light, wherein the minimum light sensing integral value corresponds to a sample collected in a time window including an entire screen blanking time; and the maximum light sensing integral value corresponds to a sample collected in a time window comprised within an entire bright screen time. determining an integral density of the ambient light per unit time according to the maximum light sensing integral value, the light sensing collecting time window, the minimum light sensing integral value and the screen blanking time; and determining a product of the integral density of the ambient light per unit time and the light sensing collecting time window as the light sensing integral value of the photosensitive element which corresponds to the ambient light, wherein the minimum light sensing integral value corresponds to a sample collected in a time window including an entire screen blanking time; and the maximum light sensing integral value corresponds to a sample collected in a time window comprised within an entire bright screen time.