The　condensed　polynuclear　aromatic　(COPNA)　resin　is　synthesized　using　coal　tar　pitch　as　monomer　and　p-methyl　benzaldehyde　(PMB)　as　cross-linking　agent　in　the　presence　of　p-toluene　sulfonic　acid.　Reaction　mechanism　was　studied　using　FT-IR　and　1H-NMR.　The　morphologies　of　COPNA　resin　were　inspected　by　SEM.　TG-DSC　was　employed　to　study　the　thermal　behavior　of　COPNA　resin.　The　results　show　that　coal　tar　pitch　and　PMB　can　be　used　to　synthesize　COPNA　resin,　the　reaction　mechanism　of　which　is　a　positive　ion-typed　condensation　polymerization　catalyzed　by　acid.　There　exist　many　micro　fibers　with　a　uniform　distribution　in　the　COPNA　resin.　The　fibers　grow　with　increase　of　modification　time,　and　then　intertwist　and　amalgamate.　Moreover,　the　COPNA　resin　possesses　good　thermo-stability　and　high　coke　value.