A method for imaging 1-D nanomaterials is provided. The method includes: providing a 1-D nanomaterials sample; immersing the 1-D nanomaterials sample in a liquid; illuminating the 1-D nanomaterials sample by a first incident light and a second incident light to cause resonance Rayleigh scattering, wherein the first incident light and the second incident light are not parallel to each other; and acquiring a resonance Rayleigh scattering image of the 1-D nanomaterials sample with a microscope.