The motion of the solid particle suspended in lubricant was analyzed by Lattice Boltzmann method.Combining Newtonian dynamics of the solid particle with a discretized Boltzmann model in the particle vicinity,the particle dynamics simulation was carried out.The governing equation for a lubrication problem involving a solid particle motion was developed.The solid particle shape was also considered in the equation.The film pressure and velocity were obtained from the equation,the film velocity was calculated in couple with particle motion,and the influence of particle shape on the film pressure was studied.The results show that when entering the lubricating oil,the particles will reach a transient stable state for an instant.Whether the initial position of particles in film thickness direction is located on the upper or lower side of the midline,the particles will move to the midline of oil film.When the particle velocity is zero,the influence on oil film pressure is greater.With the increase of particle velocity,the influence of particle on oil film pressure is decreased gradually.When the width of particles is the same in film thickness direction,the larger the aspect ratio,the greater the influence of particles on oil film pressure.When the length axis of particles is equal,the larger the width of particles in the direction of oil film thickness,the greater the influence on oil film pressure.That is,the particle which obstructs the lubricant flow more severely effects on the film pressure more significant.