Open cell ZL104 foam aluminum alloy and aluminum foam were prepared with in filtration process. The measurement of the density in v arious position found that there exists density gradient from top to bottom in b oth of fabricated foam blocks and the distinct difference between the densities in different regions depends on the solidification sequence. Moreover

the compr essive experiments for ZL104 foam alloy and aluminum foam with different densi ties were conducted. The results showed that the density has a significant effec t on compressive and energy absorbing behavior. Although the density of Z L104 foam alloy is lower than that of the pure aluminum foam

the former has h igher compressive and energy absorbing behavior than the latter.