In this research, tribological and optical properties of DLC coatings were investigated. In order to study the tribological properties, DLC coatings on gray cast iron are deposition by using two gas sources of acetylene and propylene. Coatings were deposited by using Diamanta device white ion beam method at two voltages of 900v and 1100v. The specimens were placed in ultrasonics before being placed on the device layer, and the surface of the specimens was cleened using acetone and alcohol. The adhesion test was performed using Rockwell C and was acceptable for coatings with two different gases. Investigating the spectra of Raman coatings showed that the reduction of carbon-to-hydrogen rate in gases resulted in an increase in the SP 3 percentage in the coating structure and also increased the optimal voltage. DLCcoatings of Propane has a higher SP3 content and more hardness than acetylene DLC coatings. The results of the investigation of the residual stresses of the coatings showed that increasing SP 3 percentage leads to increased residual stress. Propane DLC coatings showed higher residual stress due to SP 3 percentage. The abrasion test of the coatings was carried out under 3 load0.5 N ,1 N and 2.5 N. The results of the abrasion test showed that at 0.5 N load, the prevailing abrasion mechanism was bonded and increased with increased wear and Wear particles and the abrasion mechanism was scratched. shear stresses and abrasive tensile stresses the loss of the coating in a short slip distance, At 2.5 N.Curve coefficient coefficients of coatings showed that the coatings with higher SP3 percentage had lower coefficient of friction. The DLC P1100 coating provided the lowest friction coefficient (0.08) and best tribological behavior. In order To study the optical properties of coatings on glass and germanium substrates using 3 gas methane, acetylene and propane with different carbon to hydrogen ratios. The FT-IR test was used to investigate optical properties. The reflection of the relative reflection spectrum of methane DLC coatings in the wavelength of visible light showed that the increase in the voltage of the contact layer did not change the reflection spectrum of these coatings. Relative reflection spectra of propane DLC coatings with increasing voltage and SP3 / SP2 increase were observed in relative retardation. In the DLC coatings of acetylene Most light passing was observed at optimal voltage. The results of the relative reflection spectra in this study showed that increasing the percentage of SP3 in the structure of the DLC coatings resulted in a decrease in the percentage of reflection in the visible light wavelength range. The reflection spectral results showed that increasing the SP2 percentage leads to an increase in relative reflection and a decrease in light transmission in the visible wavelength range. Keywords: ring, DLC, wear, tension stress, Raman, friction coefficient, SP 3 / SP 2 rate, relative reflection