The electrochromic efficiency of electrochromic glasses can be enhanced by using WO3/NiO complementary electrochromic effect. The behaviors of WO3 coating and methods of its production have been reported in literature. Up to now reported NiOx coating are usually produced by rf reactive sputtering or electron beam reactive evaporation (BEV). The depositing rate of the former is slower. The electrochromic response and the change range of transmissivity for the BEV are better than that for the rf sputtering. The reaction flash evaporation method of nickel presented in this paper is without equipment of BEV. For produced systems with G/ITO/NiOx in 2M KOH solution the measured results of transmissivity spectrum to saturated colour state and bleached state indicate that the changes of transmissivity are over 60% for eye peak response (λ=550nm ). Its electrochromic response and depositing rate are also better than those of rf sputtering technology.