Abstract: Chemical plating was employed to study the metallic modification on the surface of ceno-spheres. The results of SEM and EDS analysis indicate that nickel could be plated on the surface of cenospheres comparatively homogenous. Absorbing materials made of un-modified and modifiedcenosphere were prepared and tested. The modified cenospheres exibite excellent wave absorbing properties at the testing frequency range from 8GHz to 18GHz, the reflectivity is below -10dB at thefrequency range from 16.6GHz to 18GHz and the lowest reflectivity is -13.57dB at 17.2GHz. Aeffective way is proposed for cenosphere recycle by surface modification.