a heat dissipation substrate having a first surface and a second surface, wherein the first surface is configured to be in contact with a heat source, and the second surface is opposite to the first surface and is distant from the heat source; wherein a projection region of the heat dissipation substrate that corresponds to the heat source is defined as a high-temperature region, and a low-temperature region is defined at an outer periphery of the high-temperature region;

a plurality of fins opposite to the heat source and disposed within the high-temperature region of the second surface of the heat dissipation substrate; and

a surface porous layer disposed within a range of the low-temperature region of the heat dissipation substrate.