Meta-phenylenediamine　formaldehyde　oligomer　is　prepared　and　used　as　an　accelerator　for　benzoxazine　resin.　The　structure　of　the　oligomer　is　characterized　by　Fourier　transform　infrared　spectroscopy　and　H-1　nuclear　magnetic　resonance　spectroscopy.　The　molecular　weight　and　distribution　are　measured　by　size　exclusion　chromatography.　After　mixing　the　accelerators　with　benzoxazines,　the　curing　process　of　the　mixtures　and　thermal　properties,　including　glass　transition　temperature,　thermal　stability　and　char　yield　of　the　cured　polymers　are　characterized.　Comparing　with　the　materials　prepared　from　pristine　benzoxazine　and　benzoxazine　with　molecular　accelerators,　usage　of　oligomeric　accelerator　is　able　to　promote　the　curing　and　simultaneously　enhance　the　glass　transition　temperature　as　well　as　thermal　stability　of　the　cured　network.