Eleven bis(phenoxy)naphthalene-containing poly(amide-imide)s IIIa-k were synthesized by the direct polycondensation of 2,7-bis(4-aminophenoxy)naphthalene (DAPON) with various aromatic bis (trimellitimide) s IIa-k in N-methyl-2-pyrrolidone (NMP) using triphenyl phosphite and pyridine as condensing agents. Poly (amide-imide) s IIIa-k having inherent viscosities of 0.70-1.12 dL/g were obtained in quantitative yields. The polymers containing p-phenylene or bis (phenoxy) benzene units exhibited crystalline x-ray diffraction patterns. Most of the polymers were readily soluble in various solvents such as NMP, N,N-dimethylacetamide, dimethyl sulfoxide, m-cresol, o-chlorophenol, and pyridine, and gave transparent and flexible films cast from DMAc solutions. Cast films showed obvious yield points in the stress-strain curves and had strength at break up to 87 MPa, elongation to break up to 11%, and initial modulus up to 2. 10 GPa. These poly (amide-imide) s had glass transition temperatures in the range of 255-321-degrees-C, and the 10% weight loss temperatures were recorded in the range of 529-586-degrees-C in nitrogen. The properties of poly (amide-imide) s IIIa-k were compared with those of the corresponding isomeric poly (amide-imide) s III’ prepared from 2,7-bis(4-trimellitimidophenoxy)naphthalene and aromatic diamines.