The prepare processing and electrochromic characteristics of all solid-state plastic electrochromic devices are discussed. We chose WO

3

thin film as cathode electrochromic material and NiO

x

thin film as counter electrode. All of these two thin films were coated on ITO plastic substrate respectively by low voltage reactive ion plating technology. Spectrum characters of as-deposited

bleached and colored state of these two thin films with different coating parameters were contrasted to optimize processing. It was tested that transmittance changes of WO

3

film was about 35% with argon pressure of 2.2×10

-2

Pa and oxygen pressure of 4×10

-2

Pa

transmittance changes of NiO

x

film was about 18% with argon pressure of 2.5×10

-2

Pa and oxygen pressure of 6×10

-2

Pa. Then we synthesized MPEO-LiClO

4

polymer as solid-state electrolyte

which was put in the middle of WO

3

and NiO

x

film. After binding

assembling and sealed by plastic protective films

a new type of all solid-state plastic electrochromic device with plastic/ITO/WO

3

/MPEO-LiClO

4

/NiO/ITO/plastic structure has been successful fabricated. The spectrum characters of this electrochromic device in bleached and colored states were contrasted in two-electrode cell. The changes of transmittance were real-time measured by spectrophotometer. The results show that electrochromic characters were getting stable after ten times of cycles

and changes of transmittance was about 30%. The color change of device sample could be visual displayed

so we think this all solid-state plastic electrochromic device could be widely applied in display

electrochromic windows and other fields

through making use of such electrochromic properties. It was proved that electrochromic device could be prepared on the plastic substrate with all solid-state structure

and the prepare processing was feasible. But compared with electrochromic device prepared on glass substrate with liquid electrolyte

electrochromic properties and performance of this all solid-state plastic electrochromic device need to more improve and lucubrate.