Iron-phthalocyanine (FePc) was obtained via sintering process at 700 degrees C from 4,4'-bis(3,4-dicyanophenoxy)biphenyl monomer (BPh) and ferrocenecarboxaldehyde. The iron-phthalocyanine exhibited a strong microwave absorbing at 11.0 GHz and achieved a maximum absorbing value of -23 dB with the matching thickness of 1.5 mm. Then the iron-phthalocyanine particles with strong microwave absorbing properties were added into 4,4'-bis(3,4-dicyanophenoxy)biphenyl resin to prepared FePc/BPh composites. The iron-phthalocyanine particles gave the composite to novel dielectric properties and the mechanical properties were greatly improved.