A series of hyperbranched poly(amine-ester) with terminal alcohol group(HPAE-OH) were synthesized by the polycondensation of N,N-diethylol-3-amine-methylpropionate [prepared by the Michael addition reaction of methyl acrylate(MA) with diethanolamine(DEA)] as an AB2-type monomer with trimethylol propane(TMP) as the core moiety, proceeding in one-step procedure in the melt with p-toluenesulfonic acid(p-TSA) as catalyst. Then, it was modified by maleic anhydride to obtain hyperbranched polymer with terminal carboxyl group (HPAE-C). The appropriate reaction conditions were optimized: catalyst do sage 0.7%, molar freed ratio n(OH) ∶n(maleic anhydride) =1∶1.1, reaction time 4h and temperature 80℃. The obtained polymers were characterized by IR、1H-NMR and 13C-NMR, the surface activity of polymer was investigated by Surface Tension.