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Basically corrugated board is composed of three layers of different basis weight and stock composition. Warp is well-known for one of the most important problems of corrugated board production. Warp is caused by difference of hygro-expansibility of linears between top and bottom.This research was performed to evaluate the effect of paper properties on the warp of corrugated board. To evaluate warp, dynamic expansion properties of paper was tested using DPM(dynamic penetration measuring system). The effects of sizing, stock compo-sition and wet-pressing on dynamic expansion properties were also evaluated.Commercial base papers showed different dynamic expansion property depending on stock composition and papermaking operation. Sizing treatment decreased and wet-pressing the amount of dynamic expansion. To reduce warp of corrugated board, man-agement of dynamic expansion of base papers should be controlled by manipulating mois-ture, heat and tension, using a variety of adjustments available on the corrugator.