Abstract: The degree of crystallinity of WO₃ has a great influence on its electrochromic properties. In this study, crystalline WO₃ vertical nanowire arrays were first prepared by solvothermal method, and then a layer of Ti doped tungsten oxide (WO₃-Ti) amorphous film was wrapped on the surface by magnetron sputtering technology to obtain crystalline WO₃@ amorphous WO₃-Ti core-shell composite array structure. It can be observed by SEM and TEM that the thickness of the amorphous film is about 3-7 nm, and the deposition of the amorphous layer does not destroy the nanowire array structure. Compared with pure WO₃ nanowires, the absorption peaks of core-shell nanowires have a slight red shift, and XPS detected that the characteristic peaks of W4f and Ti2p before and after recombination have shifted significantly, confirming an interfacial interaction between the shell and the core. The switching speed and coloring efficiency of the optimized WO₃@WO₃-Ti core-shell nanowires are 2 times and 1.8 times that of the pure WO₃ nanowires and the heterostructures exhibit good optical contrast in both visible and near-infrared regions, and have excellent cycling stability, with a contrast retention rate of 95.8% after 3000 cycles.