Abstract: Nickel oxide and polyaniline are typical inorganic/organic electrochromic materials,each with its advantages and disadvantages.If the two materials are combined,a NiO/PANI composite with better electrochromic properties can be obtained.In this paper,nickel oxide(NiO)nanowires/polyaniline(PANI)and the nickel oxide nanosheet/polyaniline core-shell nanostructures were prepared by hydrothermal method and electropolymerization.By scanning electron microscope,Raman spectroscopy,X-ray photoelectron spectroscopy,and electrochemical measurement device,the morphology,structure,composition,and electrochromic properties of the nanocomposite structure were studied.The results show that the electrochromic properties of the composite NiO/PANI nanowire core-shell structures are significantly enhanced in both visible and near-infrared regions.The electrochromic performance of the NiO/PANI nanosheet core-shell structure is weakened in the visible light region,but the optical contrast in the near-infrared region is significantly enhanced.This work will provide a useful reference for the research of new low-dimensional inorganic/organic nanostructured electrochromic materials and devices.