An investigation has been taken on enhancing lithium electrochromic performances of mixed organotungsten oxide (WOyCz)/organotitanium oxide (TiOyCz) films, co-synthesized onto 60 Omega/square flexible polyethylene terephthalate (PET)/indium tin oxide (ITO) substrates by a low temperature plasma polymerization method at various mixed concentrations of precursors tungsten hexacarbonyl W(CO)(6) and titanium n-butoxide Ti(C4H9O)(4). The plasma polymerized-organo-tungsten-titanium oxides (WTixOyCz) films possess notable electrochromic performances while switch tested by a potential sweep from -1 V to 1 V at a scan rate of 50 mV/s and from 1 V to -1 V at a scan rate of -50 mV/s for 200 cycles of reversible Li+ ion intercalation and de-intercalation in a 1M LiClO4-PC electrolyte, still after bended 360 degrees around a 2.5 cm diameter rod for 1000 cycles. Optical modulation (Delta T) of 74.8% for WOyCz films at a wavelength of 850 nm is appreciably progressed of up to 82.7% for WTixOyCz films as co-deposited by a low temperature plasma polymerization method.