Electrochromism was newly realized in a WO3–Pb(Zr0.52Ti0.48)O3(PZT) system which utilized the piezoelectric property of PZT ceramics for power supply. The electric power produced by Mn-doped PZT ceramics enabled the WO3film to color blue. High piezoelectricity with a peak voltage of 35 V and peak current of 1.2 mA on a 30 k&OHgr; circuit was observed at a pressure of 30 MPa for the present system. This study shows the possibility to actuate the electrochromic WO3film with PZT ceramics. ©1997 American Institute of Physics.