There is no special requirement, but I suggest that you meet the following requirements: (1) There is a rectangular box in the position where the photo is posted in your resume, and the photo size cannot completely match the rectangular box. And the aspect ratio of a photo is not necessarily equal to a rectangular frame. (2) Scale the photo in the same scale (different scales will deform the face), so that one of the length and width sides of the photo is equal to the rectangular frame, and the other is less than or equal to the rectangular frame. (3) Assume that the width is equal, but the photo length is less than the length of the rectangular box. Then put the photo into the photo frame, and the gap between the top and bottom (that is, the distance from the photo to the top and bottom of the photo frame) should be equal. (1) Supplement: If the photo is larger than the rectangular box, the length and width of the photo should be reduced in the same proportion (different proportions will deform the face); If the photo is smaller than the rectangular frame, the length and width of the photo should be enlarged in the same proportion (different proportions will deform the face). The above-mentioned "greater than" means that the length of the photo is greater than the length of the rectangular frame, or the width is greater than the width of the rectangular frame, or both. The above-mentioned "less than" means that the length and width are less than the length and width of the rectangular frame.