To solve the problem of poor performance of electrochromic films，which is the critical problem of electrochromic devices adapting to the current demand，the indium-tin oxide （ITO）/tungsten oxide （WO₃） films were prepared at room temperature by DC reactive magnetron sputtering on the polyethylene terephthalate （PET）/silver nanowire （AgNWs）.The photoelectric properties of AgNWs/ITO composite electrodes and the electrochromic properties of PET/AgNWs/ITO/WO₃ films were investigated. The results show that the sheet resistance of the ITO-compositing electrode is significantly lower than that of AgNWs electrode，and the surface is more uniform and smoother.Thereby it overcomes the uneven coloring and rapid performance degradation after a single cycle of the WO₃ film.The transmittance modulation of the flexible electrochromic film is 57.4% （at 550 nm） and 69.6% （at 1 000 nm），the colored and bleached response time is 10.4 s and 9.9 s，while the corresponding colored and bleached efficiency is 27.79 cm²/C and 40.45 cm²/C，respectively.In addition，the film can still maintain high transmittance modulation after more than 500 cycle stability tests and 2 000 bending tests，showing great application potential in the field of flexible electrochromic.