Abstract: Studies on the wave absorbability of magnetic medium absorbent/Al-alloy foams of which the surface were separately coated with Ni-Zn ferrite (CFe), nickel carbonyl (CNi) and the powdered compound of them. The coated Al-alloy foams were tested according to the Standard GJB 2038-94 'method to test the reflectivity of radar wave absorbing materials', i.e., the RCS (radar cross-section) method. The results indicated that in the 12-18 GHz band the wave absorbability of Al-alloy foams materials coated powder compound absorbent is founded between that of Al-alloy foams samples CFe and CNi which were coated with single absorbents samples. But in the 26.5-40.0 GHz band, the best wave absorbability belongs to Al-alloy foams coated powder compound absorbent in which the nickel carbonyl content is 40wt%, and the absorbability goes down gradually if the nickel carbonyl content is higher than 40wt%. So, the absorbability of Al-alloy foams coated powder compound of Ni-Zn ferrite in reasonable proportion to nickel carbonyl is available to be improved.