Copper-nickel-tin alloy workpieces on large equipment usually work under the condition of insufficient lubrication or no lubrication,so it is necessary to study the performance of copper-nickel-tin alloy materials under dry friction.The dry sliding friction and wear tests of copper-nickel-tin alloy under different load and rotating speed were carried out with CEF-I pin-disc wear tester conduct dry sliding friction wear test on copper-nickel-tin alloy under different load and speed conditions.The dry sliding wear behavior and wear mechanism of copper-nickel-tin alloy were studied by scanning electron microscope,energy dispersive spectrometer and profile detector.The results show that when the rotating speed is constant,the average friction coefficient shows a fluctuating downward trend with the increase of load,and the wear loss of copper-nickel-tin alloy specimens first increases slowly,and then increases rapidly under higher load.When the load is constant,the average friction coefficient first increases and then decreases with the increase of rotating speed,and the overall wear loss of copper-nickel-tin alloy specimens first decreases and then increases.With the increase of load,the wear mechanism of copper-nickel-tin alloy changes from slight adhesion and delamination wear to obvious adhesion and delamination wear,and then to severe adhesion and fatigue wear.With the increase of speed,the wear mechanism of copper-nickel-tin alloy changes from abrasive wear to adhesive wear and then to delamination wear.Under low load,the friction and wear properties of copper-nickel-tin alloy maintain good stability with the increase of rotating speed,so the copper-nickel-tin alloy is suitable for dry friction conditions with high-speed and low-load.