The present invention relates to a drag reduction system of KTX, which is a KTX drag reduction system for slowing the detachment of air generated at the rear end of the KTX and lowering the drag force of the KTX, And a low-speed traveling panel provided at the lower portion of the cockpit window. The high-speed traveling panel or the low-speed traveling panel selectively protrudes from the outer surface of the KTX according to the traveling speed of the KTX, And the outer shape of the KTX protrudes along the outer surface to change the outer shape of the KTX, thereby providing a drag reduction system of the KTX, which has the effect of delaying the occurrence time of the air flowing along the upper surface of the KTX during KTX driving.
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