Abstract: In order to explore the anti-friction effect of composite textured salt bath nitriding technology（QPQ technology） on the surface of 45 steel, in order to improve the service life of high-strength moving parts such as gears, air compressors, connecting rods, etc. Taking 45 steel as the sample, the human texture was prepared on its surface by laser etching technology, and the textured and smooth samples were treated by QPQ technology. The rotary friction and wear experiment was carried out on MR-070 experimental machine. The XTL-100 stereo microscope and Hitachi SU8010 scanning electron microscope were used to observe the morphology after wear. The friction reduction mechanism of the sample was observed and analyzed by hardness test, EDS energy spectrum scanning, XRD analysis and Fluent simulation analysis. The results show that the samples with human texture show different degrees of friction reduction effect compared with smooth samples, and the optimal friction reduction effect is obtained when the spacing is 300 μm. After QPQ treatment, the average hardness of the sample surface is 392.36 HV, which is about twice than that of the sample without QPQ treatment. Friction reduction effect is greatly improved. After QPQ treatment of the sample surface with human texture, the friction reduction effect is up to about 42%.