Abstract: By four synthesis steps,oil-soluble viologen with the hydroxyl group was obtained.This viologen was formed work electrode of electrochromic device with poly（ethyl acrylate-hydroxy ethyl methacrylate） and 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate via thermocuring.Contrast electrode of electrochromic device was formed by thermocuring with the material of ferrocenemethanol,poly（ethyl acrylate-hydroxy ethyl methacrylate） and 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate.Work electrode,contrast electrode and the gel electrolyte in betweem were formed all-solid-state electrochromic devices.The first threshold voltage of this electrochromic device for darkening was 1.0 V and the second was 1.5 V.The voltage for bleaching was-1.5V.This electrochromic device shows swithching time 12 and 74s for coloration and bleaching respectively for transmittance change（△T%=92.7%） at 545nm and good stability.