A substrate structure is provided. The substrate structure includes a number of traces, a substrate core, a number of first metal tiles, a number of second metal tiles, a number of first electrically-functioning circuits, and a number of second electrically-functioning circuits. The substrate core has a first surface and a second surface opposite to the first surface. The traces, the first metal tiles, and the first electrically-functioning circuits are disposed on the first surface and add up to a first metal structure proportion, and the second metal tiles and the second electrically-functioning circuits are disposed on the second surface and add up to a second metal structure proportion. The difference between the first metal structure proportion and the second metal structure proportion is within 15%.