Abstract: To investigate the effect of Ld2O3 doping on the microwave absorbability of Ni-Zn ferrite/Al-alloy foam composite, the surface of Al-alloy foam was separately coated with Ni-Zn ferrite and Ld2O3-doped Ni-Zn ferrite powdered composite (with different contents of doping). The coated Al-alloy foams were tested according to the Standard GJB2038-94 "method to test the reflectivity of radar absorbing materials", i.e., the RCS (radar cross-section) method. The topography of wave absorbent was analyzed through scanning electron microscopy (SEM). The results indicated that in the 12~18 GHz band the wave absorbability of the Al-alloy foam sample coated with Ld2O3-doped Ni-Zn ferrite is better than the sample coated with simple Ni-Zn ferrite. However, in the 26.5~40 GHz band, the best wave absorbability belongs to the Al-alloy foam coated with the powdered composite absorbent in which the Ld2O3 content is 1wt%, and the absorbability goes down if the content is higher than 1wt%. So, the absorbability of the Al-alloy foam coated with the powdered composite of Ni-Zn ferrite to which the content of Ld2O3 doping is appropriate can be improved further.