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The aim of the present research was to investigate the influence of substrate roughness on structure and mechanical properties of Titanium Aluminium Nitride (TiAlN) coatings.Tungsten Carbide rectangular block was used as substrate.Different surface roughness was achieved by using grinding discs with different grain sizes and diamond polishing powder,and TiAlN coatings were deposited on these substrates under the same preparation technique and parameters.Morphology of substrates and coatings,crystal structure,coating thickness,mechanical properties were investigated using optical microscope,AFM,XRD,CSM scratch tester and tribometer.It was shown that surface morphology of cathodic arc TiAlN coating was mainly affected by the morphology of the substrate surface and the coating growth process.The influence of substrate roughness on crystal structure and thickness of the coatings could be ignored.The adhesion force between coating and substrate increased with the decreasing of the substrate roughness.The wear resistance of the coating was also improved with the substrate roughness decreasing.