In order to study the effect of various parameters on the friction and wear properties of miter gate bottom pivot friction pair under graphite lubrication,the condition of low speed and heavy load of miter gate bottom pivot friction pair was simulated by the test of pin-disk friction pair on the UMT-2 multi-function friction and wear tester.The friction and wear performances of miter gate bottom pivot friction pairs with different surface roughness were studied under the lubrication of different particle size graphite at different friction velocity.The test results show that under different rotating speed conditions,the friction pair with surface roughness of 0.8 μm can obtain the best lubrication performance when lubricated with graphite particles with particle size of 10 μm,while the friction pair with surface roughness of 2.0 μm can obtain the best lubrication performance when lubricated with graphite particles with particle size of 21 μm.With the increase of rotating speed,the friction coefficient and wear amount of friction pair increase.It can be concluded that the size of graphite particles and the surface roughness of friction pairs jointly affect the tribological properties of friction pairs,which provides a theoretical basis for the selection of solid lubricants and the design of friction parameters for the gate bottom pivot.