A barrier structure of a plasma display panel that can prevent an excessive increase of discharging current during a supply of discharging voltage and thereby avoid damages to electrodes caused by an excessive discharging current. A plasma display panel including both a first and second substrate, the second substrate spaced a distance from the first substrate. The plasma display panel also includes sustain electrodes arranged in parallel with one another on the first substrate; data electrodes arranged on the second substrate substantially perpendicular to the sustain electrodes; and a barrier on the first substrate and projected toward the second substrate, the barrier having at least one side contacting at least one sustain electrode.