4 nanocomposites were prepared by self-propagating combustion method and an in situ polymerisation method respectively. The structure, morphology, dielectric, magnetic and microwave absorbing capability of samples were characterised. The results show the average diameter of the Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 ferrites and PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 nanocomposites is about 15 and 50 nm respectively. In the frequency range of 5?0-20?0 GHz, the reflection loss of the PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 is between 216?25 and 220?27 dB, and the maximum value is about 220?27 dB at 18?0 GHz with a bandwidth of 2?0 GHz, which is obviously higher than that of the ferrites. The saturation magnetisation (M s ) and residual magnetisation (M r ) of the PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 are 1?29 and 0?43 emu g 21 , which are smaller than those of the ferrites. However, the coercive force (H c ) of the PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 nanocomposites is 38?96 KA m 21 , which is greater than that of the ferrites.