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The effects of dual-size cellular structure with different pore size and volume proportion on mechanical properties of open-cell aluminum foams were investigated using finite element simulation,and corresponding parameters were obtained. The aluminum foams with corresponding pore parameters were prepared by infiltration process. The quasi-static compressive experiments were conducted on the materials in order to check the FEA simulative results. The experimental and FEA simulative results indicate that the strength and stiffness of the open-cell aluminum foams increase obviously when the pore structure consists of big cell and small cell in the proper size and volume ratio. The optimal size and volume ratio between small cell and big cell is 0.40 ～0.45 and 0.07～0.12,respectively.