Provided is a semiconductor package system. The system includes a substrate, a first semiconductor package on the substrate, a second semiconductor package on the substrate, a first passive element on the substrate, a heat dissipation structure on the first semiconductor package, the second semiconductor package, and the first passive element, and a first heat conduction layer between the first semiconductor package and the heat dissipation structure. A sum of a height of the first semiconductor package and a thickness of the first heat conduction layer may be greater than a height of the first passive element. The height of the first semiconductor package may be greater than a height of the second semiconductor package.