A series of hyper-branched polyimides were synthesized via A2+B3 approach using 3,3′,4,4′-benzophenone tetracarboxylic dianhydride(BTDA) and 4,4′-diaminodiphenyl ether(ODA) and poly(oxyalkylene) triamine(T-403) as materials.The structure and properties of the products were characterized by Fourier transform infrared spectroscopy(FT-IR),thermal gravimetric analysis(TGA),X-ray diffraction(XRD) and solubility test.The chemical structure of hyper-branched copolyimides was confirmed by FT-IR spectra.The thermogravimetric curve indicates that PI′s 5% or 10% thermal decomposition temperature in N2 increases as the proportion of ODA increases;the solubility test shows that the obtained hyper-branched poly(amic acid)s and the polyimide obtained by chemical imidization are soluble in several polar aprotic solvents.XRD spectrum demonstrates that the polymers have low-order aggregation structure.