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Summary form only given. Recently, wireless communication tools are very popular, however, serious electromagnetic intelference (nw) prowems have become appamnt The use of microwave absoheels is one promising technique to prevent EML In this study, polymer-protected metallic magnetic nanoparticles were prepared by the thermal decomposition of metallic cahnyl coexisting chain-polymer, and their microwave absorplion propelties were investigated Dicobalt octacahnyl (Co,(CO),) and poly (N-vinyl-2-pymlidone) (PW) were dissolved in ethylene glycol, and then heated to 130-198 "C under Ar gas flow. The XRD and TEN observations revealed the microstmcture of nanoparticles. The magnetic and microwave absolption pmpelties were measured by VSM and a vector netwolk analyzer.