The nano copper sulfide is prepared by ultrasonic atomization with Cu(NO3)2 and Na2S solutions of 0.5% (mole fraction) as raw materials. The pH value of the solution is adjusted to 6~8. The atomized Cu (NO3)2 is gradually added into the solution of Na2S which is strongly stirred. The nano-semiconductor copper sulfides (CuxS, 1≤x≤2) are obtained after aging and filtering. The influence of heated temperatures and ratio of raw materials on chemical composition of copper sulfide are analysed. The phase of copper sulfide and the chemical composition are investigated by X-ray powder diffraction (XRD). The morphological image of the copper sulfide is observed by scanning electron microscope (SEM). The absorptivity and transmittance of copper sulfide in state of sol from ultraviolet to near infrared wavelength are recorded. The results indicate that the copper sulfides are of high absorbance for near infrared light, which are attributed to the electronic transitions in the energy bands. They also have high transmittance for visible light. The transmittance declines slightly along with Cu2S approaching to CuS.