A protective device for a tube bonded on a plasma display panel (PDP). The PDP includes a plate which does not break when experiencing a first force, an air holo for passing air above and below the plate and in air communications with the tube, and doughnut-shaped base disposed around the air hole and the tube. The protective device includes a hollow shield with a first opening on a bottom end bonded to the doughnut-shaped base for containing the tube, and a binding compound for binding the hollow shield to the doughnut-shaped base. The hollow shield remains bonded to the doughnut-shaped base when experiencing a second force which is smaller than the first force. When the hollow shield experiences an external force greater than the second force, the hollow shield will separate from the doughnut shaped base without breaking the plate.