A packaging substrate includes a core layer having a first surface and a second surface. A group of ground pads is disposed on the second surface within a central region. A group of first power pads is disposed on the second surface within the central region. A plurality of signal pads is disposed on the second surface within a peripheral region that encircles the central region on the second surface. A first block-type via is embedded in the core layer within the central region. The group of ground pads is electrically connected to the first block-type via. A second block-type via is embedded in the core layer within the central region. The group of first power pads is electrically connected to the second block-type via.