Because of the light weight, high strength and better impact resistance, honeycomb paperboard is widely applied in packaging and logistics, but it is difficult to precisely predict the ultimate buckling strength for the complex buckling mechanism. Eigen and nonlinear buckling analysis of honeycomb paperboard under vertical load were proceeded by using the FEM software-ANSYS，and difference and reasons for the results of the two were analyzed. The results show that it is feasible and valuable to simulate the buckling strength of honeycomb paperboard with ANSYS but the nonlinear method is superior to eigenvalue method and the combination of the two can promote the analyzing efficiency and accuracy in theory.