3 direction flat compression properties are researched through static compression test in which laminated corrugated paperboard of B flute and C flute, load-deformation curves and stress-strain curves are drawn. The results of load-deformation curves for paperboard indicate that 3 direction compression curve shapes of laminated corrugated board are similar, there are linear deformation at the beginning, then after the maximum value, the curves of X and Z direction fall to the wave-shaped, but the curves of Y direction vibrate similar to horizontal. The results of stress-strain curves for paperboard indicate that Z direction has the maximum value of compression strength among 3 directions, X direction the second, Y direction the last, the value of Z direction is approximately 3-6 times as X direction, and 12-14 times as Y direction. In addition, the relationships are analysed between flat crush strength of corrugated paperboard and compression strength of Y direction, and between edge crush strength of corrugated paperboard and compression strength of Z direction.