A package structure comprising: a substrate, having at least one conductive units provided at a first surface of the substrate; at least one first die, provided on a second surface of the substrate; a connecting layer, provided on the first die; a second die, provided on the connecting layer, wherein the connecting layer comprises at least one bump for connecting the first die; and at least one bonding wire. The connecting layer has a first touch side and a second touch side, the first touch side contacts a first surface of the first die and the second touch side contacts a second surface of the second die, an area of the first touch side is smaller than which for the first surface of the first die, and a size of the first die equals to which of the second die.