Abstract: Based on Wenzel, Kramers, Brillouin(WKB) approximation method, the attenuation characteristics of high-frequency electromagnetic waves in nonuniform dust plasma are studied. Numerical results of complex relative dielectric constant of weakly ionized dust plasma are presented, and the effects of electron number density, dust number density on imaginary part are given. With parabolic model of electron number density distribution, attenuation characteristics of electromagnetic waves with different incident angles are analyzed, and the effects of incident angles, electron number density, and radius and number density of dust plasma are discussed. The result shows that attenuation factors are increasing with electron number density, radius and number density of dust plasma.