A first substrate has a first surface facing a second surface of the second substrate. The active chips are disposed on and electrically connected to the first surface, and spaced apart from each other by an interval, wherein the active chips respectively have a first active surface. The bridge chip is mechanically and electrically connected to the second surface, and has a second active surface partially overlapped with the first active surfaces of the active chips, such that the bridge chip is used for providing a proximity communication between the active chips. The connection structure is disposed between the first surface and the second surface for combining the first substrate and the second substrate.