Abstarct: In this experimental research, we have studied the surface morphology, structural, thermo electrical, electrical and optical properties of copper sulphide (CuS) nanostructure thin films prepared in different conditions by chemical bath deposition method. For samples characterizations the field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), UV-Vis. spectroscopy, Seebeck effect, and current-voltage (I-V) characterization were used. For preparation of CuS thin films, a mixed solution of copper sulfate pantahydrate (CuSO4·5H2O), as the source of Cu2+ ions; ammonia solution (NH3), as the complex agent; and thiourea solution (SC(NH2)2) as the source of S2- ions, were used. In this study the variable parameters are: the copper sulphide concentration, and annealing (section 4.2), precursor temperature (section 4.3) the deposition time duration (section 4.4) and finally the kind of substrate (glass, ITO and FTO) (section 4.5). Depending on the growth conditions, the FESEM images of the samples indicated the formation of nano-grains with average sizes less than 100 nm on the surface of the laxyers. The X-ray diffraction patterns and also the thermo-electrical properties in all samples show the formation of amorphous structure and p-type conductivity, respectively. Also it is found that annealing process lead to increment of acceptor-like defect concentration of the laxyers, and this in turn affect the electrical and optical properties of the samples including their transmittance spectrum and band gap. Also we found among the studied parameters increment in the time of deposition duration (2 to 4 h) lead to decrease the acceptor-like defects in the samples.