The　N-phenyl　maleimide(N-PMI)　modified　novolac　resin　was　used　to　prepare　resin　microspheres　via　suspension　polymerization　using　silicone　oil　as　dispersant.　The　morphology　of　N-PMI　modified　novolac　resin　microspheres　was　investigated　through　scanning　electron　microscope　(SEM).　The　thermal　behavior　of　the　resin　microspheres　was　studied　by　thermogravimetric　analysis　(TG-DTG).　Moreover,　The　chemical　structures　of　the　resin　microspheres　at　different　pyrolysis　temperature　were　characterized　by　Fourier　transform　infrared　spectrum(FT-IR).　The　results　show　that　the　resin　microspheres　with　size　of　10　μm~20　μm　have　fine　degree　of　sphericity　and　smoothness.　The　resin　microspheres　possess　excellent　thermal　properties　as　indicated　by　that　initial　thermal　decomposition　temperature　is　400°C　and　coke　value　arrives　at　61.8%.　Moreover,　the　pyrolysis　products　of　the　resin　microspheres　are　made　up　of　carbon　spheres　with　fine　degree　of　sphericity.