Abstract: Condensation co polymer of urushiol,aniline and formaldehyde(PUFA) had been synthesized for modifying the properties of urushiol formaldehyde condensation polymer(PUF).Its structure was characterized by IR,HPLC,DSC,DMTA,etc.Physico chemical properties were also investigated. Results showed that alkali resistance of the coating film of urushiol formaldehyde condensation polymer modified by aniline had increased by 10 times, while the excellent resistance to heat and other chemical media was similar to that of PUF.