A controlling method of fill light apparatus, wherein the fill light apparatus comprises a flashlight and a light-guide component, the light-guide component is located at a light-emitting edge of the flashlight, and the controlling method comprises: obtaining a control parameter of the light-guide component; and changing a shape and/or a light-transmitting area of the light-guide component according to the control parameter to change a light-emitting area and/or a light-emitting angle of the fill light apparatus; wherein: the obtaining a control parameter of the light-guide component comprises: obtaining a preview image of a camera module; performing a recognition of a pupil in the preview image; and if the recognition is successful, determining, according to a position of the pupil, a light-shielding area of the light-guide component to obtain the control parameter; characterized in that the fill light apparatus further comprises a diastimeter configured to detect a distance between a shooting target and the fill light apparatus, wherein the obtaining a control parameter of the light-guide component further comprises: obtaining the distance between the shooting target and the fill light apparatus; when the distance is greater than or equal to a preset distance, obtaining a first preset light-emitting angle as a target light-emitting angle to obtain the control parameter, or obtaining a light-emitting angle corresponding to the distance as the target light-emitting angle to obtain the control parameter; and when the distance is less than the preset distance, obtaining a second preset light-emitting angle as the target light-emitting angle to obtain the control parameter, wherein the second preset light-emitting angle is greater than the first preset light-emitting angle. obtaining a control parameter of the light-guide component; and changing a shape and/or a light-transmitting area of the light-guide component according to the control parameter to change a light-emitting area and/or a light-emitting angle of the fill light apparatus; wherein: the obtaining a control parameter of the light-guide component comprises: obtaining a preview image of a camera module; performing a recognition of a pupil in the preview image; and if the recognition is successful, determining, according to a position of the pupil, a light-shielding area of the light-guide component to obtain the control parameter; characterized in that the fill light apparatus further comprises a diastimeter configured to detect a distance between a shooting target and the fill light apparatus, wherein the obtaining a control parameter of the light-guide component further comprises: obtaining the distance between the shooting target and the fill light apparatus; when the distance is greater than or equal to a preset distance, obtaining a first preset light-emitting angle as a target light-emitting angle to obtain the control parameter, or obtaining a light-emitting angle corresponding to the distance as the target light-emitting angle to obtain the control parameter; and when the distance is less than the preset distance, obtaining a second preset light-emitting angle as the target light-emitting angle to obtain the control parameter, wherein the second preset light-emitting angle is greater than the first preset light-emitting angle. the obtaining a control parameter of the light-guide component comprises: obtaining a preview image of a camera module; performing a recognition of a pupil in the preview image; and if the recognition is successful, determining, according to a position of the pupil, a light-shielding area of the light-guide component to obtain the control parameter; characterized in that the fill light apparatus further comprises a diastimeter configured to detect a distance between a shooting target and the fill light apparatus, wherein the obtaining a control parameter of the light-guide component further comprises: obtaining the distance between the shooting target and the fill light apparatus; when the distance is greater than or equal to a preset distance, obtaining a first preset light-emitting angle as a target light-emitting angle to obtain the control parameter, or obtaining a light-emitting angle corresponding to the distance as the target light-emitting angle to obtain the control parameter; and when the distance is less than the preset distance, obtaining a second preset light-emitting angle as the target light-emitting angle to obtain the control parameter, wherein the second preset light-emitting angle is greater than the first preset light-emitting angle.