Poly(imide-enaminonitrile)s (PIENs), as now soluble aromatic high-temperature polymers, were synthesized by condensation polymerization of 1,4-bis(1-chloro-2,2-dicyanovinyl)benzene with several imide-containing aromatic diamines. These polymers have moderate to low molecular weight with inherent viscosities n the range of 0.19∼0.37 dL/g and can form rather brittle films. The glass transition temperatures were not detectable. PIENs exhibit excellent thermal stability. Their mass was retained up to 400∼450℃ in air and about 55% of their mass was remained at 1000℃ in nitrogen. These polymers undergo a "curing" reaction above 300℃ without emission of volatile byproducts and, finally, became insoluble. DSC thermogram showed a broad exothermic transition at around 300∼400℃ corresponding to this irreversible curing process. The uncured polymers are solvents such as 1-methyl-2-pyrrolidinone(NMP), dimethyl sulfoxide(DMSO) and N,N-dimethyl formamde(DMF), Dielectric constant of PIEN containing oxyphenylene unit was found to be about 5.